Riot police with dogs have joined emergency services at the scene of a crash after objects were thrown at officers.
Some people wore balaclavas and masks and were seen breaking up paving slabs to hurl at police in Ely, Cardiff.
South Wales Police said they were working to ‘de-escalate’ the situation and urged people to leave the area.
Two police cars were damaged around Wilson Road, where between 100-150 people gathered on Monday evening.
Snowden Road was closed between Wilson Road and Jackson Road and drivers have also been asked to avoid the area.
One police car at the scene had a smashed windscreen and its wing mirrors were broken off.
“We urge anyone involved to leave the scene immediately and ask local residents to stay away while the matter is brought to a safe conclusion,” police said.
Police tweeted later in the evening: “It is important that people avoid the area so we can effectively deal with this incident.
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This article was written by and originally published on www.bbc.co.uk