Quote Message: "Our hearts and prayers go out to the people of London, who suffered a vicious terrorist attack today. I spoke with a wonderful woman, British prime minister Theresa May, this morning and relayed America's deepest sympathy, as well as our absolute commitment to eradicating the terrorists from our planet. Radical Islamic terrorism, it will be eradicated, believe me." from President Trump, speaking at Joint Base Andrews in Maryland
- Copyright: Reuters
The BBC's Daniel Sandford asks Assistant Commissioner Rowley if they know who left the device...
Assistant Commissioner Mark Rowley said he requested permission from ministers to use members of the military for armed police duty.
He said it meant he had an extra 1000 armed police available to him.
He urged members of the public to "act on their instinct" if they saw anything concerning, and "not to hesitate" to call.
Metropolitan Police Assistant Commissioner Mark Rowley says their investigation is making "excellent progress".
He told reporters "hundreds of police officers are trawling through CCTV".
Detectives have spoken to "tens" of witnesses and 77 images and videos have been sent from members of the public.
The remnants of the device has been made safe, he said, and are being examined by forensic scientists.
Home Affairs Correspondent
A word of caution about "imminence". The terror threat level was previously raised to critical in May after Manchester. Then it was lowered again days later after it became clear to intelligence assessors in the Joint Terrorism Analysis Centre that an attack wasn't imminent. Then we had two more incidents - Borough Market/London Bridge and Finsbury Park.
What does this tell us? Intelligence is usually fragmentary. Analysts sometimes only have glimpses or impressions of what they think is going on. It's an imperfect world.
The terror threat was last at "critical", rather than severe, after the Manchester Arena attack in May.
The level was reduced after four days.
Mrs May says the military will take on some of the armed police's role.
The BBC's Daniel Sandford says people "shouldn't be surprised" to see soldiers on the streets.
The terror threat level has been raised to "critical". Here's what the levels mean, according to the MI5 website:
- LOW means an attack is unlikely
- MODERATE means an attack is possible, but not likely
- SUBSTANTIAL means an attack is a strong possibility
- SEVERE means an attack is highly likely
- CRITICAL means an attack is expected imminently
Theresa May has announced that the UK's threat level has been raised to "critical".
This means "an attack is expected imminently", according to security services.
So-called Islamic State has said it was behind the Parsons Green attack, according to a statement on its Amaq news agency.
There is a greater police presence at railway stations this evening. This officer was photographed at Euston station.Copyright: PA
The spokesperson for the UN secretary-general has been speaking about the explosion:Quote Message: We are obviously following and tracking the developments in London this morning, the attack which left many people injured. We condemn the attack and we wish a speedy recovery to those who were injured. The UN stands in solidarity with the people and government of the United Kingdom and we hope the perpetrators or perpetrator will be quickly brought to justice." from Stephane Dujarric Spokesperson for the United Nations secretary-general