Several Twitter accounts belonging to NFL teams were hacked on Monday afternoon.
The NFL's official Twitter account, as well as accounts owned by the Chicago Bears, Cleveland Browns, Green Bay Packers, Kansas City Chiefs and the Tampa Bay Buccaneers, were taken over by a group called "Our Mine."
"Hi, we're Back (sic) (OurMine). We are here to Show people that everything in hackable to improve your accounts security," the message said.
The Twitter account linked in the tweets directed to an account that was started this month. The bio link directed to a page that Twitter deemed "unsafe."
The tweets have since been deleted.