Posters featuring hammers and sickles which looked as though they had been drawn by youngsters were displayed in the doors of a primary school used as a polling station.

Alongside the drawings at Tyssen Community Primary School in Stoke Newington was the message: “The kids aren’t happy – they want change.”

The Tory party in Hackney believes electoral policy which dictates against displaying partisan material at a polling station has been breached.

Police were apparently called to the school in Oldhill Street as people turned up to vote on Thursday after a Conservative activist spotted the drawings, which stated: “Increase the schools or we’ll be fools.”

Two of the four kids’ pictures featured a hammer and sickle – the emblem of the former Soviet Union and international Communism.

A typed poster read: “We can’t you which way to vote, but the kids aren’t happy. They want CHANGE! Vote with your heart, not by what the papers tell you!”

Amy Gray, the Tory candidate for Hackney North and Stoke Newington, said: “It looks like some of Hackney’s teachers need a history lesson. I found it astounding to see the hammer and sickle.

“It is not a sexy logo and should be deplored, not celebrated - it’s the emblem of a murderous ideology which killed millions and millions of people.

“We believe there was a breach of electoral law. The poster were clearly visible from the polling station. At the very least Tyssen Primary School needs to be reminded of their obligations because this can’t happen again.”

A spokesman for the council said they made sure the posters were “covered immediately” as soon as they were made aware of them, and that no further action would be taken by the returning officer.

A spokesman for the Electoral Commission said it was “unlikely” they would take action, which would “be the responsibility for a returning officer in the first instance”.

He added: “It depends if it’s inside the polling station. The definition of where a polling station starts is not the outer door of the building. It’s where the voting is taking place, so a poster on the door doesn’t necessarily mean there is a problem with it.”