Detectives have arrested a second man on suspicion of raping an 11-year-old girl in a north London park.
The man, aged 18, was arrested in Edmonton and remains in custody, the Metropolitan Police said.
A 26-year-old who was arrested earlier on Monday has been bailed pending further inquiries to a date in late December.
The youngster is being treated in hospital after she was grabbed by a man on her way home from school on Friday afternoon.
She was dragged into Jubilee Park, in Enfield, before being raped near a pitch and putt course.
The girl, who had caught a bus from Enfield town to Bury Street, was snatched as she was walking along Galliards Road at around 4.15pm.
She eventually returned home after the attack at 7.45pm.
Detective Inspector Simon Ellershaw, who is leading the investigation, said: "This was a horrific and unusual attack of a defenceless schoolgirl making her way home via her usual route, along one of Enfield's busiest shortcuts, at the beginning of Friday afternoon rush hour.
"She says the attack happened for some considerable time - possibly in the region of two to three hours.
"At present an extensive search of the park is underway and local officers are conducting house-to-house enquiries, and we have already been receiving helpful information from members of the public.
"Given the significant and unaccounted amount of time between the incident and the victim's arrival home, we are particularly keen to speak to anyone who may have seen her possibly appearing confused or dishevelled following her ordeal. All calls will be treated in the utmost confidence."
Chief Inspector Taylor Wilson said: "Over the course of the weekend police have been working using every resource available to support the victim, identify the suspect and provide a police response to increase confidence and provide reassurance to residents.
"Although this is an isolated and extremely rare incident, we are treating this with the utmost seriousness."
Witnesses or anyone with information that could help police is asked to call the incident room on 0208 345 4326 or Crimestoppers anonymously on 0800 555 111.