“At approximately 9am this morning a group gained access to the club training ground,” a United assertion mentioned.
“The supervisor and others spoke to them. Buildings have been safe and the group has now left the positioning.”
United have been under the American family’s ownership since they completed their controversial takeover in 2005.
The Glazers have never been liked by United fans but their reputation sank to a new low after their leading role in attempting to launch the European Super League.
United co-chairman Joel Glazer was named vice-chairman of the despised breakaway competition, which collapsed on Tuesday when all six Premier League clubs involved were forced to withdraw due to the furious public backlash.
In the fall-out, United announced executive vice-chairman Ed Woodward would leave by the end of the year, while Glazer admitted “we got it wrong” in an open letter to followers on Wednesday.
Glazer has not attended a United sport in over two years and his apology speech marked his first communication with supporters in nearly 16 years.
The letter learn: “You made very clear your opposition to the European Super League, and we’ve listened. We obtained it mistaken, and we wish to present that we will put issues proper.
“Although the injuries are uncooked and I perceive that it’s going to take time for the scars to heal, I’m personally dedicated to rebuilding belief with our followers and studying from the message you delivered with such conviction.
“We proceed to imagine that European soccer wants to change into extra sustainable all through the pyramid for the long-term. However, we totally settle for that the Super League was not the correct means to go about it.
“In searching for to create a extra steady basis for the sport, we failed to present sufficient respect for its deep-rooted traditions – promotion, relegation, the pyramid – and for that we’re sorry.
“This is the world’s biggest soccer membership and we apologise unreservedly for the unrest triggered throughout these previous few days.”
Solskjaer will face questions about the Super League for the first time since the collapse at his next press conference on Friday ahead of Sunday’s Premier League match at Leeds.
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