Police were informed of the shooting on Tostrups Gate, in the Frogner area (see map) of central Oslo at 8.27am on Wednesday, operations manager Gjermund Stokkli told state broadcaster NRK.
“A young woman has been confirmed dead by medics,” the police officer in charge of the scene told newspaper Aftenposten.
The victim’s family had not yet been notified.
Just three minutes after police were alerted to the incident, a suspect was arrested in a car on the E18 motorway heading southwest towards Asker and Bærum.
“The arrest went without drama. He was arrested not long after the incident. We have seized a handgun from the suspect,” operations manager Stokkli told Aftenposten.
Police say the shooting does not appear to be a random incident.
“There is no indication that this is random, so we have reason to believe there is a link. We are working hard to find out if there is a connection between the victim and the suspect,” Stokkli said.
The whole of the street Tostrups Gate was sealed off by police on Wednesday morning.
Residents said they were awoken by the sound of gunshots.
“At first, I thought it may have been a problem with the garbage trucks. We don’t expect gunshots in this area. There were loud bangs,” one resident told Aftenposten.
Another told the paper they heard four or five shots.