By Ole Petter Skonnord
A Reuters reporter described a loud bang shortly after the arrival of Oslo’s bomb squad.
The device had appeared to be capable of causing only a limited amount of damage, the police said earlier.
Police declined to give information about the suspect.
Oslo’s Groenland area, a multi-ethnic neighborhood that is home to popular bars and restaurants as well as several mosques, is also where the city’s main police station is located, less than a kilometer away from where the device was found.
In 2011, right-wing extremist Anders Behring Breivik set off a car bomb in Oslo that killed eight people and destroyed Norway’s government headquarters, before going on a shooting rampage that killed 69 people at nearby Utoeya island.
(Writing by Terje Solsvik; Editing by Hugh Lawson and Matthew Lewis)