A Halloween event was reason for violent scenes to be seen in Lambeth, South London on Saturday. Four officers were injured during the clash and a number of arrests were made.
According to the police, a petrol bomb was also thrown during the clash.
A resident from the province said "There was a lot of smashing going on, a lot of banging. It was difficult getting home."
Organisers of the event made accusations of police in the social media, they said police were "bashing people senseless".
Crowds who joined the event, firstly gathered on Black Prince Road at Albert Embankment, across the river from Westminster.
According to the police report, the Halloween event was shut down at nearly 0700 GMT.
"The disorder and criminal damage around the venue has stopped," police said in a statement.
"There are no further reports of officers injured at this time. There is one report of a member of the public, a man, being treated by London Ambulance Service,” metropolitan police said.
Earlier, a spokesman said in regards to the event, "As well as attacking police the group also caused criminal damage to private vehicles and property in the area."