A woman in her 80s has been stabbed to death in southeast London.
Officers were called to reports of a man with a knife at Red Lion Place, Plumstead, at 8.50am.
Emergency crews found the woman with serious injuries and she was taken to hospital where she died.
Another man was also threatened with a knife but was not hurt, the Metropolitan Police said.
A man in his 60s attended a police station at 9.10am and was arrested on suspicion of murder.
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He was taken to hospital by officers, where he is receiving treatment for non-life-threatening injuries.
It is believed the suspect and the woman who died were known to each other. Officers are not looking for any further suspects.
Detective Inspector Dean Grice, who is leading the Met's investigation, said it was "a deeply tragic incident", adding "our thoughts remain firmly with the victim's family during this difficult time".
Residents will see an increased police presence in the local area, the Met said.
Detective Superintendent James Derham, who leads policing in the local area, said: "At this stage, we believe that this was an isolated incident and I want to reassure the community that there is no wider risk to the public."
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