The shooter — identified as Austin Wyatt Rollins, 17 — was injured and taken to the hospital, where he died, officials said.
Potential injuries were not immediately known and the St. Mary's County Sheriff's Office said in a statement that the incident was 'contained.'
Nikolas Cruz's half-brother, Zachary, said he visited the campus to "reflect on the school shooting and to soak it in," according to an arrest report.
Broward County releases video which confirms deputy did not confront gunman accused of staging masscre at Parkland school.
The House passed a bill that authorizes grants intended to help students and staff identify and report threats before they erupt.
When their school pulled an article from their student newspaper, Herriman High School seniors Conor Spahr and Max Gordon took matters into their own hands.
Students at Marjory Stoneman Douglas High School will walk out of class at 10 a.m. ET on Wednesday — one month after the shooting that killed 17.
The vehicle was one of two buses chartered to transport band members from Channelview High School back to Houston, Texas.
Secretary of Education Betsy DeVos tells TODAY's Savannah Guthrie that although the White House's current school safety plan does not raise the minimum age for gun purchases as President Trump originally discussed, "everything is on the table." Regarding the arming of teachers, she says, "This is an issue that is best decided by local communities and by states," but adds that she does not think that arming teachers with assault weapons would be "an appropriate thing."
Deputies are trained to "first, interrupt the shooter," but the initial officer at the Parkland school shooting didn't do that, a top sheriff's official said.