The hashtag #YouAintNoMuslimBruv is trending globally as Twitter users condemn Saturday's knife attack in London's Leytonstone subway station, which injured two people.

Several videos of police officers subduing the 29-year-old suspect — who reportedly said, "This is for Syria" — have surfaced online, where a bystander can be heard yelling "You ain't no Muslim, bruv" at the apprehended man. Bruv is a British slang term for the word brother.

The suspect is in custody Sunday, while police investigate the attack as a "terrorist incident."

Witnesses: Suspect in custody after London Underground stabbing said attack was in retaliation for Syria <a href="https://t.co/tb61mv5yEL">pic.twitter.com/tb61mv5yEL</a> —@Grasswire

Twitter users quickly picked up on the line, turning it into a trending hashtag to express their contempt for the suspect and extremism.

Many deemed it the most British response ever...

Londoners prove, once more, that they are Higher than Hate & Hypocrisy That they represent the best of Humanity <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> —@OzerKhalid

<a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> is the most british response to a terrorist attack ever —@arcanequaint

Can't get anymore British than <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> hashtag. I love this country and people so much. 😂 —@DekaDMichael11

What a legend <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> guy is. The British response to terrorism. —@Kjshaw91

... leaving others longing to be British.

Some Twitter users commended Britons for how they handled the attack, saying that other countries could learn from their example.

<a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> makes me wish I were from the UK; officers arrested him alive n ppl didn't let themselves be terrorized, U.S. can learn —@KatProgramming

One Londoner unites England against terrorism with one sentence. America could learn a thing or two from this. <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> —@kattraej

Several remarked how powerful five words could be in commenting on a larger issue.

<a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> - the power of language. One sentence pushes away extremists and unites everyone else. This is our stance now. Great. —@1CraigMorris

To the eyewitness who shouted <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a>, he spoke for millions of British voices and got the point across directly in 1 moment. —@MoFarooq9

Never were truer words said. <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> <a href="https://twitter.com/hashtag/Leytonstone?src=hash">#Leytonstone</a> —@thomasoates

One user went even further in his praise for the phrase, deeming it one of the best hashtags ever.

Man, if there was an award for "Best hashtag ever" <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> deserved it. —@khuzemaali123

There were even demands to create memorabilia emblazoned with the line.

where can I get a <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> T shirt? —@sarfrazmanzoor

Proud of my country today and thinking of getting one of these on a mug <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> <a href="https://t.co/tO7g9OkgYB">pic.twitter.com/tO7g9OkgYB</a> —@MrSamWilkin

Some were rather skeptical about the impact a single hashtag could have.

<a href="https://twitter.com/OzerKhalid">@OzerKhalid</a> <a href="https://twitter.com/_icze4r">@_icze4r</a> you're right. A hashtag will surely make them rethink their ways and surrender immediately. —@Couchmaster3000

Others were just dreading the line being uttered by British politicians, including Prime Minister David Cameron.

Several politicians have already put their Twitter support behind the phrase, including Sadiq Khan, a member of Parliament who is currently running as the Labour Party's candidate for the mayor of London.

To defeat extremism we must directly challenge their poisonous ideology <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> <a href="https://t.co/MTtZ4XjjoS">https://t.co/MTtZ4XjjoS</a> <a href="https://t.co/YK9dcrMCu0">pic.twitter.com/YK9dcrMCu0</a> —@SadiqKhan

Dreading the moment when Cameron tries to say <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> —@Warlkareham

Update: It happened.

The words left David Cameron's mouth during a press conference Monday, where he thanked police and members of the public for their response to the stabbing.

"Some of us have dedicated speeches and media appearances and soundbites and everything to this subject, but "You ain't no Muslim, bruv" said it all, much better than I ever could and thank you because that'll be applauded around the country."

When <a href="https://twitter.com/David_Cameron">@David_Cameron</a> starts to say it, you know that it's time to ditch it. <a href="https://twitter.com/hashtag/YouAintNoMuslimBruv?src=hash">#YouAintNoMuslimBruv</a> <a href="https://t.co/CuQLHuGmeY">https://t.co/CuQLHuGmeY</a> —@mrjammyjamjar1