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At least 4 people were killed and 30 others injured in a mass shooting at Apalachee High School in Winder, Georgia.

A suspect is in custody following the mass shooting around 9:30 a.m. EST on Wednesday, Sept. 4.

Local and state law enforcement responded quickly to the scene. The high school was cleared and the students assembled on the football field to wait for their parents to pick them up.

A medical flight chopper airlifted 2 of the wounded to area hospitals. Others were transported to hospitals in ambulances and private vehicles.

The FBI has joined the investigation into the shooting.

ABC News aired a phone call from a grandmother who said teachers should be armed with guns to protect the students.