Massachusetts State Police sent out a safety bulletin to law enforcement agencies this week after a Boston man posted a video to Twitter saying he was going to “take a gun” and “kill” police or EMTs.

Boston police have spoken to the man but he has not been arrested.

In the video, the man rants as he drives on what appears to be Route 24 behind a Brewster ambulance, which he claims is being used to harass him.

“So I get up to go to work and look who gets in front of me. The police using emergency vehicle to (expletive) with a (expletive) like me. But a (expletive) like me is going to take a (expletive) gun and kill one of these (expletive),” he says in the video, which was later removed.