Manchester United's game against Liverpool has been postponed after about 200 fans broke into Old Trafford to protest against the Glazer family's ownership of the club.
"This is a collective decision from the police, both clubs, the Premier League and local authorities," said the Premier League.
Talks will now take place about re-arranging the game.
Fans had gathered outside the ground and scores of green and gold flares - the colours of United's first shirts when they were Newton Heath, and of the original anti-Glazer protests in 2010 - were set off at 14:00.
The protests follow United's decision, along with five fellow Premier League clubs, to join the European Super League (ESL) last month, before subsequently all pulling out.