Several police officers were injured today in a new wave of violence on the streets of British cities, in the fourth day of riots over the killing of three girls earlier this week in the small town of Southport, in northwest England.

In recent days, riots broke out in several British cities involving hundreds of people protesting against immigrants, after false information spread on social networks that the suspect in the massacre was a radical Muslim immigrant.

Police said Axel Rudakubana, 17, the suspect in Monday's stabbing at a children's dance class in Southport, was born in the Welsh capital Cardiff, but anti-immigrant and anti-Muslim protests continued and turned into violence and rioting.

Liverpool Police said today that several officers were injured while trying to quell a "serious disturbance" in the city centre.

Authorities in the city of Hull, in the east of England, said that four people were arrested and three police officers were injured in the protests.

Advisories have been issued to increase security at mosques across the country, while police have deployed additional forces.

New British Prime Minister Keir Starmer, elected at the beginning of July, is facing his first big test. He condemned the "extreme right" for the violence and supported the police in taking tough measures. Today, he had a phone conversation with the chief ministers about the riots across the country, his office said.

According to his statement today, "there is no justification for violence".

Fighting and violence also broke out in Leeds and Manchester, as well as in Liverpool, where protesters threw eggs, beer cans and smoke bombs. In Belfast, some businesses reported property damage. Several people were arrested in London, including one for giving a Nazi salute to a counter-demonstrator.

Four police officers injured in last night's riots have been taken to hospital, and 12 people have been arrested, Mark Hall, the chief of police in Sunderland, said today.

This was not a protest. This was unforgivable violence and disorder, Hall said.

At least 30 protests are planned across Great Britain this weekend, the BBC reported, which will be organized together with numerous counter-protests by anti-racist groups.