British armed police on duty near the site of an attack at Borough Market in London

Police have named two of the three terrorists responsible for Saturday's deadly attack on London Bridge.

Khuram Shazad Butt, 27, and Rachid Redouane, 30, both from Barking, East London, were identified as the perpetrators of the knife and van attack, which killed seven people and left 49 injured.

Butt was previously known to security services but the Met Police said there was no intelligence to suggest the attack was being planned. Redouane was not known to authorities, Scotland Yard said.

Police detained a number of people in early morning raids in east London as part of the investigation into the London Bridge attack which saw the attackers ram a van into pedestrians on London Bridge before stabbing revellers in bars in the nearby Borough Market.

Isis claimed responsibility for the attack, the third major militant assault to hit Britain in less than three months.

Two of the seven people who were killed have been named, and 21 people remain critically injured in hospital.

A Canadian woman, who died in her fiance's arms after being struck by the speeding van, was named as 30-year-old Christine Archibald.

A 32-year-old man from Hackney, James McMullan, has also been identified as one of the victim's by his family.

London Bridge Terror Attack Show all 16 1 /16 London Bridge Terror Attack London Bridge Terror Attack Armed police on Borough High Street as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed Police talk to members of the public outside London Bridge Hospital as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Police Officers outside the Barrowboy and Banker Public House on Borough High Street as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed Police talk to members of the public outside London Bridge Hospital as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed police on Borough High Street as police deal with a 'major incident' at London Bridge PA London Bridge Terror Attack Emergency services near the scene of the incident Screengrab London Bridge Terror Attack People run down Borough High Street as police are dealing with a "major incident" at London Bridge Reuters London Bridge Terror Attack Emergency services arrive at the scene near Borough market at London Bridge Carl Court/Getty Images London Bridge Terror Attack Emergency personnel on London Bridge as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Police sniffer dogs on London Bridge as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack A second helicopter lands on London Bridge as police are responding to three incidents in the capital, amid reports that a vehicle collided with pedestrians on London Bridge, Scotland Yard said. Officers are dealing with reports of stabbings in Borough Market, where armed officers attended and shots were fired. They are also at an incident in the Vauxhall area PA London Bridge Terror Attack Police attend to an incident on London Bridge in London REUTERS London Bridge Terror Attack Police attend to an incident on London Bridge in London, Britain Reuters London Bridge Terror Attack A police officer escorts members of the public to safety at London Bridge Getty Images London Bridge Terror Attack Police attend to an incident on London Bridge in London, Britain Reuters London Bridge Terror Attack Police attend to an incident near London Bridge in London, Britain Reuters

Isis was said to have urged extremists to run over civilians in a poster released over the weekend featuring a knife, handgun and lorry urging radicals to "gain benefit from Ramadan".

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 also shot.

Scotland Yard said seven women and five men aged between 19 and 60 were arrested under the Terrorism Act in Barking on Sunday. A 55-year-old man was later released without charge.

A vigil was held on Monday evening near London Bridge in honour of the victims of the attack, which took place at around 10pm, while a minute's silence will take place at 11am on Tuesday.

Sadiq Khan told mourners: "As Mayor of London I want to send a clear message to the sick and evil terrorists who commit these crimes: we will defeat you you will not win.

"As a proud and patriotic British Muslim, I now say this: you do not commit these disgusting acts in my name."

Network Rail said London Bridge rail and London Underground stations reopened at 5am but the rail station will be exit only.

People from around the world were caught up as hundreds cowered in pubs and restaurants, barricading themselves inside as the attackers stalked the streets.

Armed police officers patrol outside The Shard tower and London Bridge railway station in London (AFP/Getty Images) (AFP)

Tales of heroism emerged in the aftermath, with one British Transport Police officer taking on the trio armed only with his baton before being stabbed in the head, face and leg.

An off-duty Metropolitan Police officer was also injured after he tackled the men.

Forty-eight people were left in hospital, 21 critically injured.

Police outside a property in East Ham which has been raided by officers (Getty)

As counter-terrorism police units and security services launched a huge investigation for the third time in a matter of weeks, officers arrested a dozen people in raids on flats in Barking, east London, where residents said they believed one of the terrorists may have lived.