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A "loving and beautiful" Canadian bride-to-be has been confirmed as the first victim killed in the London Bridge terror attack.

Christine Archibald, who moved from Canada to Europe to be with her fiancé, was one of seven people who died in the atrocity on Saturday night.

A French man has also been confirmed as another of the victims tragically killed.

Twelve people were arrested as armed police carried out raids in East Ham and Barking on Sunday afternoon. It came as terrorist group Islamic State claimed responsibility for the attack.

Seven people were murdered and 21 others remain critically injured after three suspects mowed down pedestrians with a van on London Bridge before stabbing victims during a terrifying spree in Borough Market.

It came as police confirmed they had made 12 arrests including seven women and five men. They were all arrested at two separate addresses in Barking on Sunday.

Prime Minister Theresa May pledged a new era of clamping down on terrorism after the attack as she declared “enough is enough” and condemned the “evil” of the perpetrators.

Canadian Prie Minister Justin Trudeau confirmed a Canadian citizen was among those killed, adding: “We grieve with the families and friends of those who have lost loved ones, and wish all those injured a speedy and full recovery.

“Londoners and people across the United Kingdom have always displayed strength and resilience in the face of adversity. We recently witnessed this after the attacks in Manchester and in the Westminster area of London. This time will be no different.”

The French foreign minister Jean-Yves Le Drian also confirmed a French man was among those killed.

On Sunday, the latest statement from the Met Police provided more details as to how the events unfolded as force confirmed 36 people are in hospital receiving treatment.

Police swooped in on flats in King's Road in Barking at around 7am on Sunday and later in Barking Road, East Ham.

Officers made 12 arrests and were still searching four houses in the capital on Sunday evening.

At the first address in Barking, police arrested a woman, 38, and five men aged between 27 and 55. Officers then arrested six more women aged between 19 and 60 at another Barking raid.

One of the men arrested has since been released without charge.

The three suspects, who police are confident were the only terrorists at the scene, wore hoax suicide bomb vests during the rampage, which began just before 10pm.

Within eight minutes the armed attackers had been shot dead by police. The officers fired 50 bullets in what the Met called an “unprecedented number of rounds” for the UK.

Among the many injured on Saturday was a member of the public who was shot during the armed police officers’ gunfire. The person’s injuries are not believed to be critical.

Assistant Commissioner Mark Rowley said: “The situation these officers were confronted with was critical, a matter of life and death - three armed men wearing what appeared to be suicide belts.

"They had already attacked and killed members of the public and had to be stopped immediately."

Harrowing eyewitness accounts emerged overnight and throughout Sunday describing how people fled for their lives or barricaded themselves in bars and restaurants.

Eyewitnesses reported seeing a white transit van – which police said had been rented – speeding along London Bridge.

Several people caught up in the attack reported seeing victims “drenched in blood” and people walking away from London Bridge in a dazed and “zombified” state.

An Australian woman told how she survived having her throat cut while out for dinner with her boyfriend.

Two police officers were also wounded in the attack, including an off-duty Met officer and a British Transport Police officer who was stabbed in the face as he tried to fight off an attacker with his baton.

London Bridge and Borough Market terrorist attack 30 show all London Bridge and Borough Market terrorist attack 1/30 Police and paramedics treat an injured person Daniel Sorabji/AFP/Getty Images 2/30 A woman is helped to an ambulance at London Bridge Daniel Sorabji/AFP/Getty Images 3/30 Armed police at London Bridge Dominic Lipinski/PA Wire 4/30 Emergency personnel tend to wounded on London Bridge Yui Mok/PA Wire 5/30 Daniel Sorabji/AFP/Getty Images 6/30 Daniel Sorabji/AFP/Getty Images 7/30 Debris and abandoned cars remain on London Bridge Chris J Ratcliffe/AFP/Getty Images 8/30 People walking down Borough High Street Dominic Lipinski/PA Wire 9/30 Armed Police officers on London Bridge Dominic Lipinski/PA Wire 10/30 People flee along Borough High Street Dominic Lipinski/PA Wire 11/30 Police officers outside the Barrowboy and Banker Public House on Borough High Street Dominic Lipinski/PA Wire 12/30 Shocked onlookers in Borough High Street Dominic Lipinski/PA Wire 13/30 Police sniffer dogs on London Bridge Dominic Lipinski/PA Wire 14/30 Armed Police talk to members of the public outside London Bridge Hospital Dominic Lipinski/PA Wire 15/30 People run down Borough High Street Dominic Lipinski/PA Wire 16/30 A helicopter lands on London Bridge Dominic Lipinski/PA Wire 17/30 An armed officer on London Bridge Dominic Lipinski/PA Wire 18/30 Police officers on Borough High Street Dominic Lipinski/PA Wire 19/30 Emergency personnel on London Bridge Dominic Lipinski/PA Wire 20/30 Armed police on Borough High Street Dominic Lipinski/PA Wire 21/30 Armed Police officer looks through his weapon on London Bridge Dominic Lipinski/PA Wire 22/30 People run along Borough High Street Dominic Lipinski/PA Wire 23/30 Police at the scene on Southwark Bridge Carl Court/Getty Images 24/30 A paramedic rushes to the scene Dominic Lipinski/PA Wire 25/30 An armed officer on London Bridge Dominic Lipinski/PA Wire 26/30 A paramedic at the scene Dominic Lipinski/PA Wire 27/30 Armed police on Borough High Street Dominic Lipinski/PA Wire 28/30 Emergency personnel on London Bridge Yui Mok/PA Wire 29/30 Police officers outside the Barrowboy and Banker Public House on Borough High Street Dominic Lipinski/PA Wire 30/30 People are lead to safety away from London Bridge Carl Court/Getty Images 1/30 Police and paramedics treat an injured person Daniel Sorabji/AFP/Getty Images 2/30 A woman is helped to an ambulance at London Bridge Daniel Sorabji/AFP/Getty Images 3/30 Armed police at London Bridge Dominic Lipinski/PA Wire 4/30 Emergency personnel tend to wounded on London Bridge Yui Mok/PA Wire 5/30 Daniel Sorabji/AFP/Getty Images 6/30 Daniel Sorabji/AFP/Getty Images 7/30 Debris and abandoned cars remain on London Bridge Chris J Ratcliffe/AFP/Getty Images 8/30 People walking down Borough High Street Dominic Lipinski/PA Wire 9/30 Armed Police officers on London Bridge Dominic Lipinski/PA Wire 10/30 People flee along Borough High Street Dominic Lipinski/PA Wire 11/30 Police officers outside the Barrowboy and Banker Public House on Borough High Street Dominic Lipinski/PA Wire 12/30 Shocked onlookers in Borough High Street Dominic Lipinski/PA Wire 13/30 Police sniffer dogs on London Bridge Dominic Lipinski/PA Wire 14/30 Armed Police talk to members of the public outside London Bridge Hospital Dominic Lipinski/PA Wire 15/30 People run down Borough High Street Dominic Lipinski/PA Wire 16/30 A helicopter lands on London Bridge Dominic Lipinski/PA Wire 17/30 An armed officer on London Bridge Dominic Lipinski/PA Wire 18/30 Police officers on Borough High Street Dominic Lipinski/PA Wire 19/30 Emergency personnel on London Bridge Dominic Lipinski/PA Wire 20/30 Armed police on Borough High Street Dominic Lipinski/PA Wire 21/30 Armed Police officer looks through his weapon on London Bridge Dominic Lipinski/PA Wire 22/30 People run along Borough High Street Dominic Lipinski/PA Wire 23/30 Police at the scene on Southwark Bridge Carl Court/Getty Images 24/30 A paramedic rushes to the scene Dominic Lipinski/PA Wire 25/30 An armed officer on London Bridge Dominic Lipinski/PA Wire 26/30 A paramedic at the scene Dominic Lipinski/PA Wire 27/30 Armed police on Borough High Street Dominic Lipinski/PA Wire 28/30 Emergency personnel on London Bridge Yui Mok/PA Wire 29/30 Police officers outside the Barrowboy and Banker Public House on Borough High Street Dominic Lipinski/PA Wire 30/30 People are lead to safety away from London Bridge Carl Court/Getty Images

Also among the victims are two Australian citizens who have been “directly impacted”, according to the country’s Prime Minister Malcolm Turnbull.

As well as the French man killed, seven other French nationals were wounded including four with serious injuries.

UK intelligence agencies, the Met’s counter-terror squad and the National Counter Terrorism Policing network are continuing to work “relentlessly” to piece together events, the Met said.

The force said they are making significant progress in identifying the attackers and understanding more about their connections and network.

AC Rowley added on Sunday night that the force are increasing "physical measures on London's bridges to keep the public safe."

He said: "The public can expect to see additional police – both armed and unarmed officers - across the capital as you would expect in these circumstances. And our security and policing plans for events are being reviewed."

Saturday’s atrocity was the third terror attack in the UK in just three months. On March 22 five people died after terrorist Khalid Masood’s car and knife attack in Westminster. Two months later 22 people were killed at an Ariana Grande concert in Manchester.

With just days to go until the General Election – which will still go ahead - politicians suspended official campaigning for most of Sunday. PM Theresa May attended an emergency Cobra meeting before speaking outside Downing Street to set out a four-pronged strategy to tackle terror.

But Labour leader Jeremy Corbyn later launched a scathing attack onto the PM, suggesting the Government police cuts were made despite warnings it would undermine safety.

Mayor of London Sadiq Khan joined the PM at the Government’s emergency committee meeting. In a statement he condemned the “deliberate and cowardly” attack and added: “We will never let these cowards win.”

He said: “I condemn it in the strongest possible terms. There is no justification whatsoever for such barbaric acts."

A vigil in honour of the attack victims is to be held on Monday evening. People will gather at Potters Fields Park outside City Hall, less than a mile from the scene of the attack, at 6pm.

Many praised the capital’s kind-hearted response following the attack with scores of kind-hearted Londoners offering shelter or free rides to those caught up in the attack.