PARKLAND, Fla. (AP) — The Latest on a deadly school shooting at a Florida high school (all times local):

6:15 a.m.

The 19-year-old suspect in a deadly rampage at a Florida high school is being booked into jail after being questioned for hours by state and federal authorities.

Television footage showed Nikolas Cruz being escorted by sheriff's deputies from the Broward Sheriff's headquarters to the county jail in Fort Lauderdale early Thursday morning.

Seventeen people were killed as gunfire erupted at Marjorie Stoneman Douglas High School just before classes ended Wednesday afternoon.

Cruz was captured in a quiet neighborhood about two miles from the school. Sheriff's officials said in an email that Cruz was initially taken to a hospital for labored breathing before being questioned at sheriff's headquarters.

Counselors are being made available for students, teachers and staff, but the school will remain closed as an investigation continues.

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1:01 a.m.

Just before the shooting broke out, some students at Marjory Stoneman Douglas High School thought they were having another fire drill.

Such an exercise had forced them to leave their classrooms hours earlier. So when the alarm went off Wednesday afternoon shortly before they were to be dismissed, they once again filed out into the hallways.

That's when police say 19-year-old Nikolas Cruz, equipped with a gas mask, smoke grenades and multiple magazines of ammunition, opened fire with a semi-automatic weapon, killing 17 people and sending hundreds of students fleeing into the streets. It was the nation's deadliest school shooting since a gunman attacked an elementary school in Newtown, Connecticut, more than five years ago.