What is the fine-grained topic of the following text: The police remained on the estate for some time as a large crowd began to gather, ultimately engaging the police in a violent confrontation, and going on to attack or loot a number of buildings (including an off-licence, a housing office, a pawn shop and perhaps most infamously a Lidl supermarket). Only return the topic.
Violent confrontation and looting by a crowd on an estate