England's Premier League said it was drawing up a new owners' charter designed to avoid future attempts to join a breakaway European Super League (ESL) as police launched an investigation into the protest that caused the postponement of Manchester United's match against Liverpool.

Fans invaded Old Trafford and ran onto the pitch Sunday as part of a demonstration against United's owners, the US-based Glazer family. Greater Manchester Police said one of their officers required emergency hospital treatment.

Anger towards the Glazers has been reignited by United's part in the failed ESL project, which collapsed within 48 hours last month after a backlash from fans, players, governments and governing bodies.

The ESL sought to guarantee top level European football for 15 founder members every season without the need to qualify on the pitch.

There have been calls for all six English clubs involved in the formation of the ESL -- Arsenal Chelsea, Liverpool, Manchester United, Manchester City and Tottenham Hotspur -- to face points penalties.

The Premier League said Monday it was "determined" to "hold those clubs accountable for their decisions and actions".

It also announced plans for a new&nbsp;charter, with all club owners signing up to a rule "committing them to the core principles" of the league, with breaches punished by "significant" sanctions.

"The events of the last two weeks have challenged the foundations and resolve of English football," the Premier League added.

"These measures are designed to stop the threat of breakaway leagues in the future."

British Prime Minister Boris Johnson, speaking Monday during a campaign visit to the north-east English town of Hartlepool, where there is a parliamentary by-election on May 6, said: "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.

"And I think that it's a good thing that we have 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, or by this government."

Hundreds of fans managed to make their way into the ground, chanting "we want Glazers out".

Large numbers of supporters had also gathered outside the stadium and there were clashes with police as they moved to disperse the crowd, with objects thrown at officers and horses.

Two officers were injured, with one "attacked with a bottle and sustaining a significant slash wound to his face, requiring emergency hospital treatment", according to a Greater Manchester Police statement.

A United statement issued Monday said reports protestors had been able to access the stadium and pitch via a gate opened by club staff were "completely incorrect".

United said what had happened was that some protestors had broken through security barriers before eventually opening an external door that let others through to the concourse area and the pitch, with another breach occurring when the door of a disability access lift was smashed.

<h2>- 'Condemn violence' -</h2>

The statement said the "majority of our fans have and will condemn criminal damage, along with any violence towards club staff, police or other fans".

But while United said they did not want peaceful demonstrators punished, they insisted they would work with police to identify those involved in criminal activity and would impose their "own sanctions" on any season ticket-holder or member identified.

Nevertheless, United stressed they "remain committed to dialogue and engagement with our fans through the Fans Forum and other appropriate channels".

Manchester City could have been crowned Premier League champions on Sunday had United lost the match.

The Premier League said a new date for the match would be announced "in due course".

England's Premier League said it was drawing up a new owners' charter designed to avoid future attempts to join a breakaway European Super League (ESL) as police launched an investigation into the protest that caused the postponement of Manchester United's match against Liverpool.

England's Premier League said it was drawing up a new owners' charter designed to avoid future attempts to join a breakaway European Super League (ESL) as police launched an investigation into the protest that caused the postponement of Manchester United's match against Liverpool. Fans invaded Old Trafford and ran onto the pitch Sunday as part of a demonstration against United's owners, the US-based Glazer family. Greater Manchester Police said one of their officers required emergency hospital treatment. Anger towards the Glazers has been reignited by United's part in the failed ESL project, which collapsed within 48 hours last month after a backlash from fans, players, governments and governing bodies. The ESL sought to guarantee top level European football for 15 founder members every season without the need to qualify on the pitch. There have been calls for all six English clubs involved in the formation of the ESL -- Arsenal Chelsea, Liverpool, Manchester United, Manchester City and Tottenham Hotspur -- to face points penalties. The Premier League said Monday it was "determined" to "hold those clubs accountable for their decisions and actions". It also announced plans for a new charter, with all club owners signing up to a rule "committing them to the core principles" of the league, with breaches punished by "significant" sanctions. "The events of the last two weeks have challenged the foundations and resolve of English football," the Premier League added. "These measures are designed to stop the threat of breakaway leagues in the future." British Prime Minister Boris Johnson, speaking Monday during a campaign visit to the north-east English town of Hartlepool, where there is a parliamentary by-election on May 6, said: "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. "And I think that it's a good thing that we have 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, or by this government." Hundreds of fans managed to make their way into the ground, chanting "we want Glazers out". Large numbers of supporters had also gathered outside the stadium and there were clashes with police as they moved to disperse the crowd, with objects thrown at officers and horses. Two officers were injured, with one "attacked with a bottle and sustaining a significant slash wound to his face, requiring emergency hospital treatment", according to a Greater Manchester Police statement. A United statement issued Monday said reports protestors had been able to access the stadium and pitch via a gate opened by club staff were "completely incorrect". United said what had happened was that some protestors had broken through security barriers before eventually opening an external door that let others through to the concourse area and the pitch, with another breach occurring when the door of a disability access lift was smashed. - 'Condemn violence' - The statement said the "majority of our fans have and will condemn criminal damage, along with any violence towards club staff, police or other fans". But while United said they did not want peaceful demonstrators punished, they insisted they would work with police to identify those involved in criminal activity and would impose their "own sanctions" on any season ticket-holder or member identified. Nevertheless, United stressed they "remain committed to dialogue and engagement with our fans through the Fans Forum and other appropriate channels". Manchester City could have been crowned Premier League champions on Sunday had United lost the match. The Premier League said a new date for the match would be announced "in due course".

Premier League reveals plan to avoid Super League repeat as police probe United protest

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Premier League reveals plan to avoid Super League repeat as police probe United protest