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

6:05 p.m.

A sheriff says 17 people have died in the shooting attack on a South Florida high school.

Sheriff Scott Israel of Broward County says the 19-year-old suspect is in custody and that investigators are beginning to “dissect” what happened in the attack Wednesday at Marjory Stoneman Douglas High School in Parkland.

He says the suspect, a former student, was previously expelled for disciplinary reasons.

Israel says the man had at least one rifle and multiple magazines.

He says most of the fatalities were inside the building though some were found fatally shot outside.

A man says he watched as officers arrested the suspect in the shooting at a Florida high school, where authorities are reporting numerous deaths.

Michael Nembhard told The Associated Press he was in his garage watching TV news coverage of the shooting when he heard a police officer repeatedly yelling, “get on the ground!”

Nembhard says he looked up to see a teenage boy on the ground about 150 yards (meters) away with an officer pointing a gun at him. The officer stood over the boy until other officers arrived, handcuffed him and led him away.

A federal official who spoke on condition of anonymity identified the suspect as Nicolas Cruz. The official says he wasn’t authorized to discuss it publicly.

Authorities say the suspect is a former student about 18 years old.

5:20 p.m.

A federal official has identified the Florida school shooting suspect as Nicolas Cruz.

The official spoke to The Associated Press on condition of anonymity. The official says he had been briefed on the investigation into the shooting at the South Florida high school, but was not authorized to discuss it publicly.

Authorities in Florida say the shooter opened fire at the school Wednesday afternoon, killing “numerous” people. The shooting sent frightened students running out into the streets and SWAT team members swarming the building.

Authorities later announced that they had taken a former student, about 18 years old, into custody after locating him off the school grounds.