Police were forced to break up a late-night election count fracas on Thursday evening.
A row broke out as Liberal Democrats in Labour-controlled St Helen's suffered a series of setbacks, leading to disappointment for the party's leader on the council, Brian Spencer who lost his seat.
According to witnesses at St Helen's Town Hall there was a confrontation between Mr Spencer and Labour candidate Mark Johnson, who fell across a table and landed on his mother.
Labour councillor Andy Bowden said: "As the results were coming in it was becoming clear the Lib Dems had lost quite a few seats."
He added: "There were quite a lot of police in the room and at least two interjected and separated everyone."
Coun Bowden said Mr Johnson may have twisted his ankle and was giving a statement to police.
It is understood police officers intervened, but no arrests were made.
Lib Dem councillor Michael Haw said Mr Spencer, the council's ex-opposition leader, was upset at losing his seat.