Broward County Public Schools officials respond to deadly school shooting

Parents wait for news after a reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (AP Photo/Joel Auerbach)

One day after 17 people were killed and at least a dozen injured in the deadliest school shooting since Sandy Hook, the Broward County Public Schools responded Thursday on Twitter.

"Our hearts are heavy as we deal with the horrific Marjory Stoneman Douglas High School tragedy that is impacting our community. Marjory Stoneman Douglas High remains closed for the rest of the week. There is increased law enforcement presence at each of our District schools."

Officials say 19-year-old Nikolas Cruz, a former student who had been expelled, opened fire at the Marjory Stoneman Douglas High School Wednesday afternoon with an AR-15 rifle that he had purchased legally.

The Associated Press reports the teen's adopted parents had recently passed away.

The tragedy marked the 18th mass shooting in the U.S. this year.

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