The Islamic State group has claimed responsibility for the attack on Westminster in London which left four people dead.
That's according to its news agency Amaq.
UK Prime Minister Theresa May says the man who attacked passers-by and police in Westminster was born in Britain.
He was also known to police and intelligence services.
She's been giving a statement to the House of Commons after the attack on Wednesday that left four people dead.
8 arrests have been made.
Olly Barratt has more on that IS claim of responsibility.
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