Two buses full of protesters were taken to Anand Vihar police station and released a few hours after the demolition was over, said a senior police official.
According to the police, the demolition of a part of the Laxmi Narayan temple took place in adherence to a court order.
The concerned authority which carried out the demolition had informed the police in advance and asked them to be present in order to maintain the law and order situation.
The court had ordered its demolition a few months ago.
The temple authorities were informed yesterday night about the demolition.