The Islamic State terror group has claimed responsibility for the London terror attacks which killed seven and left 21 fighting for their lives.

The terrorists brought carnage to the streets of the capital on Saturday night, mowing down pedestrians with a van on London Bridge before stabbing a police officer and revellers around Borough Market with 12-inch knives.

One of the attackers shouted “this is for Allah” as he knifed a man near a pub.

The head of the SITE intelligence group says the terror group claimed its fighters carried out the attack.

The first victim of the attack has been named as Canadian national Christine Archibald, who worked in a homeless shelter until she moved to Europe to be with her fiance.

Saturday night’s atrocity in the capital was the third terrorist outrage to hit the country this year.

The three men, wearing fake suicide bomb vests, were shot dead by eight officers outside a pub after police opened fire with an “unprecedented” hail of 50 bullets, while a bystander was injured, hit accidentally by a stray bullet.

Prime Minister Theresa May delivered a stark assessment of the threat facing the UK, saying that although there was no direct link between the three incidents, “terrorism breeds terrorism”.