Two councillors have been suspended by Reform UK "pending an investigation into their conduct".
Northumberland County councillors Nicole Brooke and Patrick Lambert have both had the "whip suspended pending investigation for breaching the Reform council group rules".
"In a manner that could be detrimental to the party's interests," a statement indicated.
Another Reform councillor, John Allen, was also suspended earlier this month.
All three suspended councillors were elected in May after a full council vote saw Reform UK surge to the second largest party on the Conservative-led council.
However, the suspensions see the number of Reform councillors in the authority fall to 20.
Mr Lambert holds the position on the audit and standards committee.
Ms Brooke holds a position on the licensing and regulatory committee.
The details on their suspension have not been made public
| FACEBOOKWhile the details have not been made public, Reform UK said it was investigating a breach of the council group rules.
According to the BBC, Mr Allen was suspended after allegations - which the publication could not verify - about online comments threatening to kill the Prime Minister.
Mr Allen represents the Hirst ward.
He is being investigated by his party after a YouTube commenter said he would shoot Sir Keir Starmer if given the chance.
John Allen has also been suspended by Reform
|NORTHUMBERLAND COUNTY COUNCIL
The comments were posted on an account with the username @johnallen7807 and reportedly discovered by a campaign group Hope Not Hate.
A Reform UK spokesman had previously told the BBC that Mr Allen had been suspended "pending investigation".
He holds positions at Northumberland County Council's county emergency committee, licensing committee and the Ashington & Blyth Community Partnership.
Mr Allen also sits on the Northumbria Police and Crime Panel.
GB News does not suggest Mr Allen made the comment or that the YouTube account belonged to the councillor.
Mr Allen, Ms Brooke and Mr Lambert have each been contacted for comment by the People's Channel.