The two men seized control of the vehicle at around 12.30pm on Tuesday, and then raced it through the streets of the city's northern Torshov district for fifteen minutes, driving onto a pavement to deliberately target pedestrians, until they were finally stopped by police.
An armed man stole an ambulance in Oslo today and ran down several people including a baby in a pushchair before being shot by police.
Police shot at the tires to stop the ambulance and did not target the man, Fredriksen said.
Police opened fire on the auto to stop the criminal.
NRK said police are looking for another person who may have been involved, but authorities wouldn't confirm the report.
The Aftenposten newspaper published a photo showing a man, wearing green pants lying next to the vehicle surrounded by police officers. "We got him now", a police spokesman said.
The yellow ambulance smashed into a house wall with a police vehicle crashed into its rear. "They are twins, seven months old, they are being treated", an Oslo University hospital spokesman said.
Police arrested the man after firing on the vehicle. "He is not in critical condition".
A witness told the newspaper - one of Norway's largest - that he saw "the ambulance driving at high speed toward me ... and right behind a police vehicle". "We are conducting a broad, intensive investigation", the police added in a statement.
The investigation was in its early phase, with no information to suggest the incident was related to terrorism, police said.