Masked men threw bottles of beer and urinated on a mosque following a march against Muslim extremism.
Bacon was also left on cars near Kingston Mosque during the attack by a group of 10-15 youths on Sunday.
Kingston Mosque claimed baseball bats were also used in the incident on East Road, but this was not confirmed by police.
However officers did recover two pieces of wood near the scene.
Police were called to the mosque at 1.15pm and arrested three white males, who have since been released on bail without charge.
Rizwan Khaliq, spokesman for the Kingston Muslim Association, said: "Under the pretence of protesting against extreme elements within the Islamic faith, a group of masked men congregated outside
the mosque shouting obscenities at the mainly elderly congregation inside.
"They urinated against the mosque walls, threw beer-bottles, and used baseball bats to smash windows.
"It is a miracle that nobody was injured and only superficial damaged was caused.
"Such despicable actions have no place in our community and it is something that we must all unite against.
"All decent folk must come together and unite against the hate agenda – which has no place in our community."
Muslims are forbidden from eating pork by the Koran.
Earlier on in the day about 60 people holding Union Jacks and a large wooden poppy had chanted "Muslim bombers off our streets" as they marched through Kingston.
The protest had appeared to pass off peacefully and the crowd had dispersed from Clarence Street by 12.15pm.
Detective Chief Superintendent Martin Greenslade said police were investigating any link between the attack on the mosque and the march.
However Ben Baty, 20, of Sunbury, who organised the march, said: "I think it's disgusting. It's the kind of behaviour I thought my march would not attract. I wanted people from other communities to
"Even when people were shouting 'Muslim bombers off our streets' I was not happy but obvously people did not know how to express themselves.
"I'm saddened and shocked this happened because I thought the group there was very well behaved. Hopefully these people will be brought to justice."
Mr Baty said the march was against extreme Islam and poppy burning.
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