The shooter who opened fire inside Apalachee High school is believed to be a 14-year-old boy, a law enforcement source tells CNN.

The source said it is not yet known whether the teen attended that school.

We cannot continue to accept this as normal,” the president said in a statement.

At least four people are believed to have been killed and approximately 30 more were injured in the shooting at Apalachee High School in Winder, Georgia, although it’s unclear how many of the injuries are from gunshot wounds, according to law enforcement sources.

Apalachee High School is located in the city of Winder, Georgia, which is a community about an hour outside of Atlanta.