Police are appealing for witnesses and information after a young woman was sexually assaulted while sunbathing in Bushy Park, south London.
The Metropolitan Police were called to the incident at around 12pm on Thursday at the park near Hampton Court Palace in Richmond-upon-Thames.
According to reports the woman had fallen asleep while listening to music with her headphones on and was awoken by the attack.
Police have described the suspect as being in his late 20s, wearing a white T-shirt and dark tracksuit bottoms.
The area was searched by officers but the suspect was not found.
Any witnesses or anyone with any information are asked to call police on 101 or call Crimestoppers anonymously on 0800 555 111.
Police presence in the area has been increased and anyone who sees anyone acting suspiciously in any parks should call police on 999.