It's going to look like the end of the world has hit the Barclays Center tonight, but don't panic, guys—It's just a drill.

The Office of Emergency Management has issued a warning to the people of Brooklyn that the FDNY and U.S Marine Corps will be holding a disaster drill from 8 p.m. Friday until 2 a.m. Saturday, and that the public may be subject to some startling scenes during that time: NBC reports "military vehicles and personnel in hazardous materials suits" will be on view, and City Room reports, um, bloody people.

An OEM spokesperson said she couldn't confirm what exactly would be visible to the public—we'll update this story when we hear back. In the meantime, NMTBP. (Never Mind the Bloody People.)