British police said that mental health was a significant factor in a knife attack in central London that left one woman dead and five people injured but that they could not rule out terrorism as a motive.
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Armed police arrested a 19-year-old man at Russell Square after he attacked a woman, who was in her 60's and who died from her injuries at the scene.
"Early indications suggest that mental health is a significant factor in this case and that is one major line of inquiry," London Metropolitan Police Assistant Commissioner Mark Rowley told reporters.
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"But of course at this stage we should keep an open mind regarding motive and consequently terrorism as a motivation remains but one line of inquiry for us to explore."
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