A man handcuffed to gates at Buckingham Palace has "sustained a number of self-inflicted slash injuries" said police as they continue to negotiate with him.
The person wearing a white T-shirt and a baseball cap could be seen talking to police officers as people looked on in shock before they were evacuated at around 5.30pm today and the area was put into lockdown.
Police have said that the man, who also looks to have laid a book or folder of papers in front of himself, is believed to be in his 30s and "threatened to harm himself".