Police were called to Fishponds Park in Surbiton, south-west London, just before
7.15am on Thursday morning.
A 24-year-old man has been arrested on suspicion of sexual assault and
administering a substance with intent to commit a sexual offence.
A 35-year-old man and a 36-year-old man have additionally been arrested,
each on suspicion of rape, sexual assault, and administering a substance with
intent to commit a sexual offence.
Another man, aged 41, has also been arrested on suspicion of rape.
All four suspects remain in custody, the Metropolitan Police has said.
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