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WILMINGTON, Del.—After a gunman shot a Delaware state trooper inside a DMV office near Wilmington on Tuesday, the wounded trooper pushed a nearby employee to safety before the gunman shot him again, killing him, authorities said. A police officer then confronted, shot and killed the gunman.

The trooper, who has not yet been named, was working an overtime assignment at the reception desk when the 44-year-old gunman walked in, approached the trooper and fired, state police said at a news conference Tuesday night.

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