(AP) Sen. Bill Nelson of Florida says the shooter in the attack on a high school in his state wore a gas mask and had smoke grenades.
The Florida Democrat said in an interview with CNN that he was briefed on the attack by the FBI.
Nelson says the attacker "set off the fire alarm so the kids would come pouring out of the classrooms into the hall. And there the carnage began."
Nelson says he did not know if the gunman had used the smoke grenades but he assumed that's why he had a gas mask on.