A brick was thrown through a window of Angela Eagle’s office overnight, her office has said.
Police have been informed after the Labour leadership candidate’s consistency office in Wallasey was targeted.
In a statement, Merseyside police confirmed they were investigating what happened.
Yesterday Eagle launched her bid to unseat Corbyn as leader of the Labour Party. This morning the former shadow business secretary said she could give the party the “strong leadership” Corbyn could not.
Labour MPs were quick to condemn what happened – with one suggesting the atmosphere created by Corbyn was to blame.
Merseyside police said today: “Merseyside Police can confirm they were called to premises in Manor Road, Wallasey, today, Tuesday 12 July, following reports of criminal damage.
“It is believed that between 5pm last night (Monday) and 9am today, damage was caused to the front ground floor window of an office.
“The incident was reported to Merseyside Police at 9.55am today. An investigation into the incident is ongoing.”
Labour’s NEC will today vote on whether Corbyn needs to get the support of 51 MPs to make it onto the ballot in the leadership contest – a number he would be unlikely to be able to achieve.
Len McCluskey, the general secretary of the Unite union, has said it would be a “sordid fix” if Corbyn was denied the automatic right to get onto the ballot and fight off the challenge from Eagle.