One person has been killed in a knife attack in Russell Square

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The Somali teenager arrested on suspicion of murder has been named by sources as Zakaria Bulhan, after a woman was stabbed to death and five people injured in the attack in Russell Square.

The 19-year-old Norwegian, of Somali origin, was Tasered by police outside the Imperial Hotel, in Southampton Row.

He was initially in hospital under armed guard but was this morning moved to a police station and arrested on suspicion of murder, police confirmed.

Norway's foreign ministry said the teen emigrated from the Scandanavian country to Britain in 2002 when he was five years old.

Darlene Horton, an American woman in her 60s, was treated at the scene but died a short time later.

Florida Governor Rick Scott named her as Darlene Horton, the wife of Richard Wagner, an eminent psychology professor at Florida State University (FSU).

The couple, who were in London while he taught in the summer session at FSU's London Study Programme, were due to fly home today.

Five people - two women and three men - were taken to hospital for their injuries.

None of their injuries are life-threatening, but a British man who was stabbed in the stomach, remains in hospital. His condition is described as serious but stable.

They are British, Israeli and Australian citizens.

Matthew Barzun, US Ambassador to the UK, tweeted: "Heartbreaking news that a US citizen was killed in #RussellSquare attack.

"My prayers are with all the victims and their loved ones."