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ISIS claimed responsibility on Sunday for an attack by knife-wielding men who mowed down and stabbed revellers in London, killing seven people before being shot dead in a barrage of police gunfire.

The attack began at about 10 p.m. local time Saturday, when three men drove a van into pedestrians on London Bridge, police said.

Police shot and killed the attackers, and 12 people were arrested in Barking in east London.

It is the third terror attack in the United Kingdom in three months, following the auto and knife attack on Westminster Bridge in March, in which five people were killed, and the Manchester bombing less than two weeks ago, in which 22 people were killed.

Islamist militants, or people claiming allegiance to the group, have carried out scores of deadly attacks in Europe, the Middle East, Africa, Asia and the United States over the past two years.

Both the ruling Conservative Party and the Labour Party said on Sunday they would suspend their national campaigning for the upcoming election for a day.

"Yes my brother was involved", she said.

Assistant Metropolitan Police Commissioner Mark Rowley said that while police believe all the attackers were killed, the investigation is expanding.

London Mayor Sadiq Khan called on British citizens not to be cowed by the attacks and to vote on Thursday, as "one of the things these terrorists hate is voting; they hate democracy".

"He got me", he said of the attack.

"They went 'This is for Allah, ' and they had a woman on the floor".

Officials said that seven people died in the Saturday night attack and roughly 48 were wounded.

There was no immediate claim of responsibility for the attacks, which come days ahead of a June 8 national election, and less than two weeks after 22 people were killed in a suicide attack in the northern city of Manchester while attending a concert by USA pop singer Ariana Grande.

Less than two weeks ago, a suicide bomber killed 22 children and adults at a concert by US singer Ariana Grande in Manchester in northern England.

"He's lived here for about three years", resident Damien Pettit said.

Scotland Yard said a member of the public also sustained a gunshot wound as eight officers fired an "unprecedented" barrage of 50 bullets at the attackers.

London Bridge and a large area on the south bank of the River Thames remained cordoned off on Saturday, and police told people to avoid the area.

Kathy Christiansen, executive director of Alpha House in Calgary, said Archibald had worked at the non-profit until recently and that she will remain in the hearts of her friends and colleagues.

Grande, who headlined a benefit concert in Manchester on Sunday, alongside stars including Pharrell Williams and Justin Bieber, tweeted that she was "Praying for London". It had been raised to critical after the Manchester attack, then lowered again days later.

Another witness called Eric told the BBC he had seen three men get out of the van and thought they were going to help tend those who had been run over.

She said the series of attacks represented a perversion of Islam and that Britain's counter-terrorism strategy needed to be reviewed, adding, "It is time to say enough is enough". A London Transport Police officer armed only with a baton when he confronted the attackers was among those seriously injured with face, leg and head stab wounds.

"I chucked it, but I think I missed one of them, and then I picked up a stool, and I threw it at him".

"They kept coming to try to stab me. they were stabbing everyone".

Too many senior officers in state police forces had bowed to "political correctness" in concerning themselves with a potential community backlash during terrorist attacks, he said.

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