That tragedy marked the 123rd child under the age of 11 killed or wounded in gunfire since January 1. It was also the second fatal shooting of a child shooting of that day.
Police named the victim as 39-year-old Dannta Holmes.
Authorities only learned of the threat through a teacher's husband.
Six middle-aged white people were killed in similar manners in Missouri.
Police are working to discover whether the shooting was part of a dare.
Kalashnikov USA has a facility near Marjory Stoneman High School in Parkland.
Hillsborough County includes cities such as Tampa.
Police responded to Dalton High School after receiving reports of shots fired around noon. Investigators discovered a teacher barricaded inside a classroom.
The New Jersey teacher had expressed fears that a shooting could happen at his school.
Wallenpaupack South Elementary School will temporarily move its students while a controversial nearby church hosts an event that is expected to involve semi-automatic rifles.
Children experiencing depression, anxiety, and fear following the Parkland high school massacre have been flooding Florida mental heath faclities.
The teenager killed 17 people with an assault rifle at his former school last week.
President Donald Trump slammed a deputy officer who didn't enter Marjory Stoneman Douglas High School while a shooting was in progress.
Peterson has resigned after footage at from Marjory Stoneman Douglas High School showed him hiding during the shooting.
A Florida state representative's aide was dismissed for circulating the conspiracy theory.
Poll after poll shows near-universal support for some form of gun control, yet some politicians remain reluctant to cross the NRA. What are they so scared of?
During a powerful address in Tallahassee, Prado lamented the failure of a system that allowed Cruz to purchase a gun.