car before pursuing the gunman into the school.

Once inside, Giamanco and the shooter engaged in a physical altercation before the shooter was shot and killed.

Teacher's heroic actions recognized

Officials also confirmed during Friday's news conference that there was another teacher inside the classroom during the shooting.

When the suspect entered the room, she threw her cellphone at the suspect and then tackled him, attempting to take the firearm from him. She was not injured during the incident.

Gunman was a former student

What we know:

The suspect was identified as 16-year-old Griffin John II, a former special needs student at Silver Rail Elementary School.

Officials said that John II used a Maverick 88 pump action, 12-gauge shotgun during the shooting. He had a total of 44 remaining rounds of 12-gauge ammunition on his person or inside his backpack.

What we don't know:

The motive of the shooting was not immediately known.