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The attack in the northwest England town of Southport shocked the country and triggered days of disorder after far-right activists seized on incorrect reports that the attacker was a Muslim migrant who had recently arrived in the U.K.

Over several nights, crowds attacked housing for asylum-seekers, as well as mosques, libraries and community centers, in the worst street violence Britain had seen since riots in 2011.

Attacker , who was 17 when he carried out the rampage at a Taylor Swift-themed dance class, is the British-born son of Rwandan Christian parents. He is serving a with no chance of parole for 52 years for killing Alice Da Silva Aguiar, 9, Elsie Dot Stancombe, 7, and Bebe King, 6, and wounding eight other children and two adults.

Longstanding contempt-of-court rules, intended to ensure fair trials, hampered police in correcting online misinformation, and a ban on naming suspects under 18 meant the attacker’s identity was withheld from the public for several days.

A tweet falsely identifying the attacker, posted on the day of the stabbings, was retweeted thousands of times and viewed by millions of people, the lawmakers said. Police did not state that the information was false until the next day, and even then did not release the attacker’s name.

Conservative lawmaker Karen Bradley, who heads the Home Affairs Committee, said “bad actors sought to exploit the unspeakable tragedy that unfolded in Southport.�

“By failing to disclose information to the public, false claims filled the gap and flourished online, further undermining confidence in the police and public authorities,� she said. “The criminal justice system will need to ensure its approach to communication is fit for the social media age.�

The committee of lawmakers from both government and opposition parties also said police struggled to monitor the sheer volume of content on social media. It called for government support “to monitor and respond to social media at a national level.�

The government said it agreed that “social media has put well-established principles around how we communicate after attacks like this under strain, and we must be able to tackle misinformation head on.� It has asked the Law Commission to carry out a review into contempt of court rules.

The government also has set up a public inquiry into how the system failed to stop the killer, who had been referred to the authorities multiple times over his obsession with violence.

The lawmakers’ committee, which heard from police, prosecutors and experts during its inquiry, also said there was no evidence to support allegations of “two-tier policing� in Britain. Politicians and activists on the political right have argued that those arrested over the summer disorder were treated more harshly than climate change activists or Black Lives Matter protesters.

More than 1,000 people have faced criminal charges over the violence, which saw 69 police officers treated in hospitals.

“Those participating in disorder were not policed more strongly because of their supposed political views but because they were throwing missiles, assaulting police officers and committing arson,� the lawmakers said. “It was disgraceful to see the police officers who bore the brunt of this violence being undermined by baseless claims of ‘two-tier policing.’�