Pentagon briefing: Officer dead, suspect killed after burst of violence outside Pentagon

An officer died after being stabbed Tuesday during a burst of violence at a transit station outside the Pentagon, law enforcement officials said. The Pentagon, the headquarters of the U.S. military, was temporarily placed on lockdown after gunshots were fired Tuesday morning near the entrance of the building, A Pentagon police officer who was stabbed later died, according to officials who were not authorized to discuss the matter and spoke to The Associated Press on condition of anonymity.