Police are examining CCTV footage after three people, including an officer, received head injuries in a protest at a Sikh cultural centre.
Up to 200 people went in the building in Dudley on Saturday angry that meat and alcohol was being served, which they feel is against the religion.
It is understood they were there for five hours until managers agreed to ban the supply of meat and alcohol.
A man arrested on suspicion of violent disorder was released on police bail.
Police said "significant damage" was caused to the centre.