A man has been detained after a stolen ambulance crashed into a family in the Norwegian capital Oslo, injuring three people - including twin babies.

Public broadcaster NRK showed images of the ambulance driving through the city as gunshots were apparently fired from inside the vehicle.

The alleged hijacker sustained gunshot wounds after police returned fire.

A motive for the attack has yet to be established. Police say they are searching for a second suspect.

A woman who "appears to be under the influence" is also thought to have been involved in the incident, the AFP news agency reported.

Police say a man stole the ambulance on Tuesday afternoon and drove it at pedestrians in the capital.

An Oslo University hospital spokesman told the Reuters news agency that seven-month-old twins were injured.