Detectives are trying to find a 49-year-old man as part of a murder investigation after two bodies were found within hours of each other at separate addresses in central London.
The Metropolitan Police said anyone who sees Lee Peacock should not approach him, but call 999.
Detective Superintendent Luke Marks, of the specialist crime command, said: “I am appealing today for information about the whereabouts of 49-year-old Lee Peacock, who we need to speak to urgently about the murders of two people in Westminster.
“Officers have been working round the clock to track him down and I am asking anybody who sees Lee to call us immediately on 999. I would urge members of the public not to approach him, but instead to call police as soon as possible.”