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A new video timeline released on Tuesday by FBI Boston shows a person of interest in the deadly Brown campus shooting walking near campus – and at one point after the shooting – walking by responding officers.

It traces the person of interest in 15 different video clips on Saturday. 

The six and a half minute video shows the person of interest walking toward campus and, at one point, running.  

The last video before the shooting shows the person of interest walking right next to the Barus & Holley building where the shooting happened.

FBI Boston posted the video timeline and then promptly deleted the X post. It's unclear why the post was removed. The FBI Boston then reposted a shorter version of the timeline.

The Providence Police Department (PPD) on Tuesday released new "enhanced" video footage of the person of interest in the Brown University mass shooting.

Footage shows the unidentified person of interest walking past a home on the east side of Providence prior to the fatal shooting.

PPD released the minute-long video minutes after FBI Boston posted and quickly deleted a longer 6-minute video.

As authorities continue their search for the unidentified gunman accused of fatally shooting two Brown University students and wounding 9 others on Saturday, critics have called the university's immediate response following the shooting into question.

Not only did Brown University’s Alert Siren on campus fail to activate, the first alert message sent out to students and staff came at 4:22 p.m., 17 minutes after the shooting happened.

The person of interest was seen walking away from the Barus and Holley engineering building on surveillance video at about 4:06 p.m., according to authorities.

The first BrownUAlert read: "There's an active shooter near Barus & Holley Engineering. Lock doors, silence phones and stay hidden until further notice. Remember: RUN, if you are in the affected location, evacuate safely if you can; HIDE, if evacuation is not possible, take cover; FIGHT, as a last resort, take action to protect yourself. Stay tuned for further safety information."

The Providence Police Department (PPD), which continues to be the lead investigative agency on the case, sent out an alert 43 minutes after the shooting, at 4:49 p.m. Saturday, but did not confirm the nature of the incident.

"There is currently heavy Providence Police and Fire presence on Hope Street near Brown University," PPD's alert read. "Please exercise caution and avoid this area until further notice."

Nearly an hour and a half after the shooting, at 5:33 p.m., police finally confirmed multiple people were shot "in the area of Brown University," requesting students shelter in place.

Fox News' Bryan Llenas contributed to this report.

Officials have released a new enhanced image of the person of interest being sought in connection with the deadly mass shooting at Brown University. 

Attorney General of Rhode Island Peter Neronha told cable news network MS NOW that the “enhanced photograph” is a “major step forward” in identifying the person of interest.

Providence Police said authorities plan to release additional media related to the investigation.

Rhode Island Hospital on Tuesday said a second student wounded in the mass shooting at Brown University has been discharged. 

Two students were killed and nine others were wounded when a gunman opened fire inside a classroom in the Barus and Holley engineering building on university’s campus in Providence. The hospital treated all nine wounded victims for gunshot injuries. 

Of those victims remaining in the hospital, five patients were listed in critical stable condition; one was in critical condition; and one was listed in stable condition, the hospital said in an update Tuesday afternoon. 

One student had been discharged shortly after being brought to the hospital on Saturday. 

The hospital did not immediately provide updates on their specific injuries. 

“Rhode Island Hospital is working closely with and providing support to all impacted family members and remains in continuous communication with Brown University,” the hospital said.

Brown University President Christina H. Paxson released a message to the community on Tuesday mourning the loss of two “beloved” students, Ella Cook and Mukhammad Aziz Umurzokov, in a mass shooting that happened on campus over the weekend. 

“Three days ago, we lost two members of our Brown community to an act of unimaginable and senseless violence,” Paxson wrote . “These were two young people whose amazing promise was extinguished too soon.” 

Paxson said Cook was a sophomore and Umurzokov was in his first semester. 

“While it is impossible for words to fully convey Ella’s and Mukhammad’s impact and potential, I want to share a little bit about them as we grieve their loss and seek to honor their memories,” the message read, in part. “Both were brilliant and beloved — as members of our campus community, but even more by their friends and families. Our hearts continue to be with them in their profound sorrow.” 

Paxson described Cook as an accomplished competitive pianist and a volunteer leader for the her church near her hometown in Alabama. 

“She was known for her compassionate, loyal and courageous spirit, and we understand she was described by a church leader as a ‘tremendous bright light’ who brought peace and faith to all those around her,” Paxson wrote. 

Umurzokov was “driven, conscientious and disciplined,” especially in his pursuit to become a neurosurgeon, the message said. 

“A first-year student, he arrived this fall with a passion for medicine born from a personal experience, and he planned to concentrate in biochemistry and molecular biology to help realize his dream of becoming a doctor,” Paxson wrote. “His friends and family have spoken of his clear commitment to serving others.”

Cook is survived by her parents, her brother and sister. Umurzokov is survived by his parents and two sisters.

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"America’s Most Wanted" co-host Callahan Walsh says investigators are up against steep challenges in the Brown University shooting case as the search for the gunman enters a fourth day. 

"The fact that there's very little information is very concerning," Walsh said Tuesday, pointing to a shortage of evidence on "Fox & Friends." 

Authorities released video of the suspect, believed to be about 5 feet 8 inches tall with a stocky build and dressed in dark clothing, but Walsh said the footage offers almost nothing for the public to work with. 

"There's a lot of people that match that description, unfortunately," he said, adding that the grainy video is unlikely to generate an identification from anyone who doesn’t already know the suspect personally.

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Fox News Digital has compiled all surveillance video that investigators have released as of Tuesday morning showing a person of interest wanted in connection with the Brown University shooting .

The person of interest seen in the videos wearing all black and a face covering. The individual is seen walking on foot in what appears to be a residential area.

Investigators have described the person of interest as a male, approximately 5 feet 8 inches tall with a stocky build.

The FBI has offered a $50,000 reward for information leading to the suspect’s identification and arrest.

Authorities have said anyone with information can contact the FBI at 1-800-CALL-FBI (225-5324) or the Providence Police Department at 401-272-3121. The public can also visit tips.fbi.gov.

Fox News Digital's Michael Ruiz contributed to this report.

Fox News Digital observed a stream of FBI agents — some wearing jackets with “Evidence Response Team” emblazoned on the back — heading into a rear entrance of the Barus and Holley engineering building early Tuesday on Brown University’s campus on the east side of Providence, R.I. 

Crime scene tape is still set up around the property, and at another one of the building’s entrances nearby, a new memorial for the victims was growing. The attack on Saturday left two Brown University students dead and nine injured. 

“For those who were injured and for those who should still be with us today, Rhode Island will always remember,” read one sign placed at the memorial. 

“When is enough, enough?” read another. 

Next to bouquets of flowers, a stack of dry erase markers lay on the ground, encouraging others to pay their respects. 

On the other side of campus, where the police presence appeared scaled downward compared to recent days, mourners also paid tribute to the two deceased — Ella Cook, of Birmingham, Alabama, and Mukhammad Aziz Umurzokov, of Virginia. 

“Our community will never be the same. Rest in peace, Ella + Mukhammad,” read one message there, while another, addressed to Mukhammad, said, “may you finally rest in peace, have solace and respite from this cruel world.”

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Phoebe Peus, a close friend of Brown University shooting victim Ella Cook, gave a tearful tribute to her friend on “America’s Newsroom” on Tuesday.

Peus, a senior, remembered the 19-year-old sophomore as “such a bright light” and “extremely welcoming.”

“It’s such a devastating loss, I can’t believe she’s not with us anymore,” Peus said of her friend.

Peus said she was in the Brown Republicans club along with Cook and a small group of other students. Cook was vice president of the Brown University College Republicans.

“Ella really was outspoken, and I just want to live through her in that way and make a difference,” she said.

Cook was unsure about what she wanted to pursue following college, according to Peus, starting as a French major and thinking about switching to economics to potentially pursue a career in policy.

“She was so bright she could have done what she wanted,” the senior said.

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Fox News Digital walked the potential path that the suspected gunman took after the deadly shooting at Brown University on Saturday. 

The shooting happened inside a classroom in the Barus and Holley engineering building around 4 p.m. Saturday. Two students were killed, and nine others were wounded. 

The potential path shown begins outside the engineering building, crosses a street and continues down a sidewalk to a nearby intersection where a person of interest dressed in all black was seen walking on surveillance video released by police. 

Authorities have since released additional surveillance videos showing the person of interest walking on the sidewalk through what appears to be a residential area.

The person of interest was described as a male, approximately 5 feet 8 inches tall with a stocky build.

A vice president of College Republicans and an aspiring neurosurgeon have been identified as the two students killed in the mass shooting at Brown University on Saturday. 

Ella Cook, of Birmingham, Alabama, and Mukhammad Aziz Umurzokov, of Virginia, were named as the two students killed when a gunman opened fire inside a classroom in the Barus and Holley engineering building on the campus of the university in Providence, Rhode Island. Nine other students were wounded. 

Cathedral Church of the Advent in Birmingham said Cook was one of its parishioners. 

"Some of you haven’t heard, a lot of you have heard ... [about] the tragedy yesterday at Brown University, the shooting of a number of people," Rev. Craig Smalley said in a video the church posted of its Sunday service. "Tragically, one of our parishioners, Ella Cook, was one of those who was killed yesterday."

Cook was a sophomore at the university. She was also vice president of the Brown University College Republicans.

Virginia leaders named Umurzokov as the second victim killed. 

"I am heartbroken to learn that Mukhammad Aziz Umurzokov — who just graduated from Midlothian High School — is among the victims of the horrific act of violence at Brown University," Virginia Governor-elect Abigail Spanberger wrote on X.

Umurzokov’s family wrote in a GoFundMe post that he "had big dreams of becoming a neurosurgeon and helping people."  

This is an excerpt from an article by Fox News Digital's Stephen Sorace and Andrea Margolis. To read more, click here.

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Former Department of Homeland Security advisor Charles Marino joined “Fox & Friends First” to discuss the latest on the investigation into the fatal mass shooting at Brown University as officials released new images of a person of interest.

Marino said law enforcement will likely have to release more details on the investigation to the public as the hunt for a suspect continued on Tuesday.

“They’re kind of getting backed into a corner here and having to release more and more information,” he said. “Initially during these investigations, less is more in terms of the information that you’re putting out.”

Officials released new videos showing a person of interest dressed in all black and a face covering walking in what appears to be a residential area.

Marino said the surveillance videos were “underwhelming in general, but you never know what someone may pick up on,” like a type of jacket or style of walk.

“With respect to the video footage, you always want to put out information that’s going to assist the public and assist law enforcement in getting valid tips coming in,” he said.

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Videos released by authorities shows a person of interest walking the streets hours before a gunman opened fire at Brown University.

The Providence Police Department released the footage to the public in an effort to identify the person seen on camera.

Authorities described him as approximately 5 feet 8 inches tall with a stocky build.

Images show a person dressed in dark clothing with a face mask and beanie walking in what appears to be a residential area.

The gunman “definitely targeted” Brown University, though authorities are looking for other possible motives, officials said Monday.

“What I can tell you is that this individual definitely targeted Brown University,” Chief Colonel Oscar L. Perez, Jr. said at a news conference.

“Obviously, it’s something we’re looking into, as far as if there was anything else that he was targeting," he added.

Perez said the families of the victims have been cooperative and that authorities were investigating reports that the gunman yelled something during the shooting.