It was a last-minute sign war in Cambridge, Ont. as Conservative and Liberal campaign teams accused each other of obscuring campaign signs in the final hours of the federal election campaign.

Late Sunday night, Liberal "Stop Harper" lawn signs were blocked from view by Conservative signs for incumbent Member of Parliament Gary Goodyear.

Volunteers for Liberal Bryan May's campaign said they were putting up candidate signs for May on Sunday night when they noticed they were being followed by another vehicle.

Campaign signs of Conservative candidate Gary Goodyear planted close to Liberal "Stop Harper" signs in Cambridge, Ont. on election day, October 19, 2015. (Colin Butler/CBC)

They said the person inside was following behind, sandwiching the red "Stop Harper" signs with "Re-elect Gary Goodyear" signs, leaving just a few centimetres between the two.

Seeing three signs sandwiched so close together caught the eye of Anthony Freitas, who stopped his car to take a closer look while on a lunch break from his nearby workplace.

"I think it's political bullying," he said Monday. "I'd expect them to behave more like grownups."

Bryan May's campaign say they've filed a police report with the Waterloo Regional Police Service. The police said Monday they were not aware of any such complaint.

Conservatives say Liberals stickered

Goodyear's campaign manager Ron Dancey dismissed the Liberal campaign's concerns.

"They're just whiners," said Dancey, pointing out the Conservative campaign volunteers did nothing wrong.

"What we haven't done is what they have done, which is put stickers on our things saying 'Stop Harper'."

Dancey said he has reported the stickers to the Commissioner of Canada Elections.

Elections Canada confirmed to CBC News in Kitchener that there are no rules prescribing a minimum distance between campaign signs, though some cities hae specific rules in their municipal sign bylaws.

Liberals deny stickering signs

May's campaign team denies putting stickers on Goodyear's signs, claiming the stickers belong to a non-partisan Stop Harper campaign.

"We in this campaign have used 'Stop Harper' for our election signs, but we never made stickers," said Sandy Jackson, communication lead for May's campaign. "Those accusations are completely baseless."

Jackson said that while the Elections Canada Act does not prohibit campaign signs from being placed close together, it does say that "no person shall prevent or impair the transmission to the public of an election advertising message."

"When you put signs that close on either side, nobody can read our political message," Jackson said, "so our contention is that they've clearly interfered with the transmission of our political message."