Police are apparently searching for a person in the Thames near Battersea Bridge.
The news arose after the Metropolitan Police Service's Twitter page for their helicopter unit tweeted a message just before 1pm today.
The Met Police press office has yet to confirm details of the incident but several other Twitter users have said they saw a person jump from Battersea Bridge.
One Twitter user, Connor Grieve, said: "Just watched someone jump off Battersea Bridge."
Another, The Prophet Ivey, said: "So.. Someone just tried commit suicide on Battersea Bridge."
Did you see anything? Contact the news desk on 020 8789 4739 or email jhenderson@london.newsquest.co.uk.
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