A 19-year-old man has been arrested on suspicion of murder after a US citizen in her 60s was killed and five other people were injured in a knife attack in Russell Square.

Emma and Mark Pigdon visiting the capital from County Durham were their way back from the theatre when they saw the incident unfolding.

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Emma said: "We just saw a woman lying on the street. She looked like she had a pattern on her clothes but it turned out to be blood.

"She was a really small lady, really slight, which made me think she was a teenager. We were shocked when we later heard she was in her 60s."