Police are treating as suspicious the discovery of a body close to a tourist hotspot in central London.
A member of the public found a man with injuries in Hyde Park shortly before 6am on Friday.
The man was dead when officers arrived at the scene, the Metropolitan Police said.
Police set up a cordon spanning an area the size of two football pitches in the park following what an officer at the scene called an "unexplained death".
The body, which was close to Speakers' Corner, could be seen under a tree before investigators in white crime scene suits erected a tent over it.
At least 30 officers were at the scene at one point as part of the investigation - which is being carried out by Homicide and Major Crime Command.
In a statement, the force said: "This incident is being treated as suspicious. No arrests have been made and inquiries are ongoing."
The Met said next of kin have not yet been informed and asked anyone with information to contact them.
Investigators in blue suits were seen searching the vast cordon as they placed markers in a trail across the scene.
Police later extended the cordon - increasing it to double its initial size - as their investigations continued.
The man's body was taken away in a private ambulance at around 3pm.
A man who lives close to the park, who gave his name only as Lee, said: "I was walking with my dog and it was very obvious there was a lot going on up ahead of me.
"Once I got there I realised there was a major crime scene - they were in the midst of finishing taping it off.
"Under the trees I could just make out what appeared to be a body with an aluminium blanket over it."
Anyone with information or witnesses should call the police non-emergency line on 101 or Crimestoppers anonymously on 0800 555 111.