A woman is in a serious condition in hospital after being shot in the early hours of Saturday morning in Oxford.
The woman, who is in her forties but has not been named, was taken to the John Radcliffe Hospital with "serious but not life-threatening" injuries, an ambulance service spokesman said.
A man aged 21, from Oxford, has been arrested on suspicion of attempted murder, Thames Valley police said.
Two other men, aged 26 and 40 and also from Oxford, have been arrested on suspicion of affray.
Paramedics were called to Crowberry Road, in the Blackbird Leys area of the city by police at 5.15am on Saturday, South Central Ambulance Service said.
South Central Ambulance spokesman James Keating-Wilkes said the victim was "concious and breathing".
Detective Inspector John Turner, leading the investigation, said: "I would like to reassure the local community that incidents such as these are extremely rare.
"Police officers and PCSOs will be undertaking extra patrols in the area to provide a reassurance to the community of Blackbird Leys.
"I would urge anyone with any information about the incident to contact the police immediately."