What you need to know about the Oklahoma firefighters who died in the Oklahoma City Bombing
(AP) More than 30 people were killed and more than 600 injured when a homemade bomb detonated in a classroom in the school building in the heart of Oklahoma City on Wednesday, officials said.
Officials said a man opened fire with a shotgun on about 6:30 a.m.
(8:30 p.m.) in the classroom at the Dorcas Elementary School in the northeast Oklahoma City neighborhood of Dorcas.
The blast sent a fireball into the classroom, destroying the classroom and the nearby building.
Authorities said one person was in critical condition after surgery, while two others suffered non-life threatening injuries.
It was not clear if the two men were related.
Authorities evacuated the building and the surrounding area.
The school is part of a private elementary school, which has about 2,300 students.
There are more than 4,000 children enrolled in the nearby Oklahoma State Fairgrounds.
The building was constructed in 1965 and has a roof-to-ceiling window on each side of the school, said Kevin Smith, the superintendent of Doras Elementary School.
He said authorities were trying to determine the motive for the attack, but did not have enough information to say whether the bomber had been known to the school.
The building has a history of problems, he said.