An apparent terrorist attack in London that left four people dead and 20 people injured on Wednesday is fueling a wave of anti-Muslim commentary on the web in some of Britain’s most conservative online communities. A shooter, who was killed in gunfire with police, forced a lockdown at the Palace of Westminster, where the British Parliament meets. At the same time, a car barreled through civilians and tourists on nearby Westminster Bridge.

“All those so-called Muslim-only zones should be raided, said Robert Tillman, whose comment on the official Facebook page for Britain First, a right-wing extremist group, amassed over 200 Likes by the time this story was published. “Anyone aggressively protesting (i.e. rioting) immediately arrested and deported to their own country right away. No second chance.”

The attack bears a striking resemblance to the ISIS attack on Brussels, which occurred a year ago to the day, but as of late Wednesday afternoon, the identity of the shooter had yet to be released, and one attacker was still at large. Nothing is yet known about the motives of the attackers, but far right-wing groups in England were quick to lay blame for the attack.

Tillman’s Islamaphobic comment inspired hundreds more like it on Britain First and other right-wing British pages such as the English Defence League, and comments like this were made mere minutes after news of the attack broke, despite no reliable information being available at the time.

“Its [sic] time we now regained our country from these savages MAY DID NOT LISTEN start deporting now we have had enough!!!!” said Martin Aaron on the Britain First Facebook page just after the attack.

That the British right would be quick slander Muslims is depressingly unsurprising for those who’ve followed the right-wing populist uprising that’s disrupted politics and governments throughout the West. The first major victory for the movement was in Great Britain when the country voted to leave the European Union in June of last year after a deeply Islamaphobic campaign that made Syrian refugees the centerpiece of the “Leave” campaign’s case against EU membership.

Suspected London Terrorist Named As Hate preacher Abu Izzadeen (Trevor Brooks). (@LaStampa) pic.twitter.com/OZfSejAFig — Breaking911 (@Breaking911) March 22, 2017

The rush to assign blame extended to British news media as well, as some outlets reported the attacker to be an extremist preacher named Abu Izzadeen. One outlet withdrew their report, but not before his identity had ricocheted through social media. An unofficial but popular Tennessee Republicans Twitter account tweeted an absurd comparison between Izzadeen and Muslim-American activist Linda Sarsour, and even Donald Trump, Jr., the president’s son, retweeted a report that the attacker was Izzadeen.

Given the nature of the attack, it’s possible — likely even — that the attack was committed by ISIS or ISIS-sympathizers. But the confluence of Islam and terrorism in the minds of the populist right in the West continues to be a troubling development that has broad implications for peace with and within the Middle East.