A teenager has been arrested after a woman was stabbed in the stomach while walking her dog in a "random and unprovoked" attack.
The stabbing happened at about 10:30 BST in woodland in Boxhill Park, near Clifton Drive, Abingdon.
The woman, who is in her 50s, is receiving treatment at the John Radcliffe Hospital in Oxford.
Police said a 17-year-old boy from Abingdon has been arrested on suspicion of attempted murder.
Det Insp Ali Driver described the incident as "a random and unprovoked attack".
He said: "Incidents such as this are exceedingly rare, and people in the area are likely to see an increased number of police officers while our investigations continue."