A teenage girl walking to school along a busy street was abducted by two men and sexually assaulted, police have said.
The girl, who was wearing a school uniform at the time, was grabbed near Marston Ferry road and Banbury road in Oxford at about 8.25am on Wednesday (28 September).
She was bundled into a silver car by two white men and was later found by officers in nearby Cavendish Drive, Marston, at midday after she knocked on residents' doors in the area.
"Between the victim being taken from the street and her being found in Cavendish Drive she was subjected to a serious sexual assault," Thames Valley Police said.
The girl is being supported by specially trained officers.
Police say they have stepped up patrols in the area and have urged any children walking to school to travel in groups.
Det Ch Insp Simon Steel said: "We are in the early stages of this investigation and we are carrying out extensive enquires.
"This happened in what would have been a very busy area at this time of the day and I appeal to anybody who was in that area this morning and saw an incident which matches the above report to call police immediately.
"It is possible you may have witnessed this incident and may not have realised the severity of the situation."
Supt Christian Bunt added: "This is a very concerning incident for all involved and I appreciate that it must be very concerning for the public.
"In light of this we are stepping up patrols in the area to provide reassurance and there will be a very visible police presence whilst the investigation continues.
"I would advise anyone worried about this incident to please speak to a neighbourhood officer or contact 101, or if you are worried about a child's safety please call 999.
"I would ask parents to consider the safety of their children and if they are walking to school make sure they try to keep in groups. I would also ask people to remain vigilant and report anything suspicious."
Anyone with information is asked to contact Thames Valley Police on 101 quoting URN 1631 28/09/16.