An investigation has been launched after "Jail Starmer" graffiti was daubed on the window of an MP's office.
The Met Police received an allegation of criminal damage on Saturday in relation to the incident at Clive Efford's office in Eltham & Chislehurst, South London.
This is a new seat which was won by Labour at the general election, though in 2019 it was notionally Conservative.
On Friday night the window was painted with white graffiti which says "Jail Starmer".
Sources told Sky News' political editor Beth Rigby that an image of the vandalism has been circulating among Labour MPs' WhatsApp groups this morning. However, Mr Efford has downplayed the incident.
There have been growing concerns about the safety of politicians in recent years, following the murders of Jo Cox and Sir David Amess.
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MPs have described working in an increasingly hostile environment, with experiences ranging from death threats and abuse to attacks on their constituency offices and protests at their homes.
Ahead of the general election, Tory MP Mike Freer stepped down over concerns for his personal safety, saying an arson attack on his constituency office was the final straw.
The latest incident comes as the Labour Party Conference is about to kick off in Liverpool.
It is the first time in 15 years the event has been held while the party is in government.
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In a statement, the Met Police said: "On Saturday 21, September, police received an allegation of criminal damage to an office building in Westmount Road SE9.
"Graffiti had been daubed on the premises the previous day.
"An investigation has been launched and enquiries are ongoing.
"Anyone with information is asked to call 101 quoting CAD 2672/21Sep."
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