"You'll hear a noise that's external to the room and you'll see their reaction to it," one Coast Guard officer explained, comparing the sound to a slamming door.
The two Israeli Embassy staffers who were set to be engaged before they were gunned down by a pro-Palestinian gunman outside the Capital Jewish Museum Wednesday night have been identified.
The president, who was at the White House on Wednesday for an Oval Office meeting with South African President Cyril Ramaphosa, said the killings were done out of hate and radicalism.