A man who caught a shocking knife attack at a London Underground station on camera can be heard saying "you ain't no Muslim, bruv" to the man - prompting a flurry of support and solidarity online.
The eyewitness - who reportedly is a Muslim east Londoner - appears to be responding after the man reportedly shouted "this is for Syria" during the attack in which three people were injured.
After the footage appeared online, the hashtag #YouAintNoMuslimBruv began trending on social media, with many expressing support and "London pride" for the phrase.
Some also praised the actions of the police who responded and used tasers on the attacker to subdue him.
The Metropolitan Police say they are investigating the attack as a "terrorist incident".
One man was seriously injured and two sustained minor injuries, police also said.