UPDATE: Another Attack in London – 7 Dead

UPDATE: Here's the latest on the London attacks from the Associated Press.

LONDON (AP) — The SITE Intelligence Group says Islamic State's news agency is claiming fighters for the extremist group carried out the van and knife attack in London that left seven people dead.

SITE said in a statement Sunday that the Islamic State's Aamaq news service cited "a security source" in the Arabic-language posting claiming the attack.

Islamic State has often made such claims not just when it has sent attackers, but when extremists carrying out deadly plots were inspired by the group's ideology.

It's the third attack this year that Islamic State has claimed in Britain, after the bombing in Manchester and a similar attack in the heart of London in March.

The three attackers in Saturday's attack have not been identified.

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London police say they are responding to reports that a vehicle hit pedestrians on London Bridge and that there were stabbings at busy Borough Market nearby.

Soon after they responded to another incident in the Vauxhall area, over a mile away.

The Metropolitan Police says armed officers have been sent to the scenes and shots were fired. They did not say if officers fired the shots.

The force has tweeted a warning telling people in the area to run to safety, hide and then call police if it is safe to do so.

A spokesman for Prime Minister Theresa May says she is being briefed on the incident at London Bridge.

The spokesman says the prime minister is in contact with officials and is being regularly updated.

May has not commented yet but in the past she has convened her emergency security Cabinet known as Cobra after major incidents.

Britain's official terror threat had recently been lowered from "critical" after a bombing killed 22 people at an Ariana Grande concert in Manchester.

U.S. President Donald Trump's spokesman says Trump has been briefed by his national security team and he will be provided with updates.

British Prime Minister Theresa May says an incident involving a vehicle and reported stabbings in London "is being treated as a potential act of terrorism."

May says it is a "fast-moving investigation" and her thoughts are with those caught up in the "dreadful events."

Police say a vehicle reportedly ran down pedestrians on London Bridge, and there were resports of stabbings nearby. They has also responded to an incident in another area of London, Vauxhaul.

The BBC says more than one person has been killed.

Jeremy Corbyn, the head of the Labour Party, said on Twitter: "Brutal and shocking incidents reported in London. My thoughts are with the victims and their families. Thank you to the emergency services."

Downing Street says Prime Minister Theresa May will chair a meeting of the government's emergency response committee on Sunday.

A spokesman for May says the prime minister is in contact with officials and is being regularly updated.

May has not commented yet but in the past she has convened her emergency security Cabinet known as Cobra after major incidents.

Britain's official terror threat had recently been lowered from "critical" after a bombing killed 22 people at an Ariana Grande concert in Manchester.