A Massachusetts-based company has seen a spike in sales of bullet-proof backpacks in the wake of a deadly school shooting in South Florida.

TMZ reported that the company, Bullet Blocker, sold 500 backpacks on Thursday alone.

Those backpacks cost anywhere from around $200 to $500, and most of the bags sold this week are going to Florida, according to TMZ.

The backpacks contain a Kevlar liner capable of withstanding a gunshot.

ADVERTISEMENT

The spike in sales came a day after a gunman opened fire on Marjory Stoneman Douglas High School in Parkland, Fla., killing 17 and wounding 14 others.

The accused shooter was identified as 19-year-old Nikolas Cruz, a former student at the school who had been expelled for disciplinary reasons. He was charged on Thursday with 17 counts of premeditated murder.

The shooting in Parkland, about 25 miles north of Fort Lauderdale, was the latest school shooting to roil the nation and reignite a debate over gun control and safety in U.S. schools.

So far this year, there have been eight shootings in U.S. schools that resulted in either injury or death, according to a tally by The Guardian.