Boris Johnson addresses Man United protest
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United fans protesting against the club's American owners, the Glazer family, stormed into the stadium which was closed to fans due to COVID-19 restrictions.
A flare was thrown at the broadcasters podium as fans ran on to the field and protesters clashed with police outside the ground.
Greater Manchester Police (GMP) said two officers were injured with one requiring hospital treatment after he was attacked with a bottle and suffered slash wound to his face.
The fan protests against the Glazers, which have been taken place since they bought the club in 2005, have been reignited since United's involvement in the attempt to create a breakaway European Super League.
Prime Minister Boris Johnson, who publicly opposed the Super League plans, said he understood the motives behind the protests.
"I don't think it's a good idea to have disruptive behaviour, demonstrations of that kind, but on the other hand I do understand people's strength of feeling," Johnson told reporters during a campaign visit in Hartlepool in the north of England.
"I think it's a good thing that we've been able to do things that make it pretty clear that the European Super League is not going to be appreciated by the people of this country."
No decision has yet been made on the rescheduling of the match or about any sanctions for Sunday's events.
