Londoners respond to metro attack with #YouAintNoMuslimBruv
The attacker seriously injured one man and wounded two others in what the Scotland Yard is treating as "a terrorist incident".
One Twitter user posted a video showing police restraining the alleged attacker, while an onlooker could be heard shouting, "You ain't no Muslim bruv."
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Within minutes of posting the video, people on Twitter began to use the hashtag #YouAintNoMuslimBruv to condemn the attack.
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Many suggested #YouAintNoMuslimBruv represented real London:
Commuter defends young Muslim girl from attack on London tube