The Islamic State in Iraq and Syria has claimed responsibility for Saturday’s terror attack in London that killed seven people and injured scores more.

The SITE Intelligence Group said ISIS’s Aamaq news agency, cited “a security source” in the post taking responsibility.

"A detachment of Islamic State fighters carried out the London attacks yesterday," the message said.

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The London attackers drove a van into pedestrians on London Bridge, before going on stabbing sprees in bars and restaurants in the area.

Police say all three of the suspects have been shot dead.

This is the third terror attack the U.K. has faced in the last two months. A truck plowed into pedestrians on Westminster Bridge in March, and a suicide bomber targeted an Ariana Grande concert in the northern English city of Manchester two weeks ago.

British Prime Minister Theresa May said the recent attacks in the U.K. are linked together by the "single, evil ideology of Islamist extremism that preaches hatred, sows division and promotes sectarianism."

At least a dozen suspects have been arrested in Great Britain in the wake of the attack.