Violent unrest has erupted in several towns and cities in Britain in recent days, and further disorder broke out on Saturday as far-right agitators gathered in demonstrations around the country.

The violence has been driven by online disinformation and extremist right-wing groups intent on creating disorder after a deadly knife attack on a children’s event in northwestern England, experts said.

A range of far-right factions and individuals, including neo-Nazis, violent soccer fans and anti-Muslim campaigners, have promoted and taken part in the unrest, which has also been stoked by online influencers.

Prime Minister Keir Starmer has vowed to deploy additional police officers to crack down on the disorder. “This is not a protest that has got out of hand,” he said on Thursday. “It is a group of individuals who are absolutely bent on violence.”

Here is what we know about the unrest and some of those involved.

Where have riots taken place?

The first riot took place on Tuesday evening in Southport, a town in northwestern England, after a deadly stabbing attack the previous day at a children’s dance and yoga class. Three girls died of their injuries, and eight other children and two adults were wounded.

The suspect, Axel Rudakubana, was born in Britain, but in the hours after the attack, disinformation about his identity — including the false claim that he was an undocumented migrant — spread rapidly online. Far-right activists used messaging apps including Telegram and X to urge people to take to the streets.