Oslo: Norway's security service says a 17-year-old had been arrested in connection with an explosive device found near a busy subway station in Oslo on Saturday.
Signe Aaling, chief prosecutor with the PST security service, said on Sunday the youth was detained on suspicion of handling explosives.
![An officer stands guard as police cordon off a large area in Oslo around a subway station on a busy commercial street ...](/web/20170425154734im_/http://www.canberratimes.com.au/content/dam/images/g/v/g/y/g/0/image.related.articleLeadwide.620x349.gvgych.png/1491753403623.jpg)
Security service head Benedicte Bjornland said it was unclear if the teen had plans to carry out an attack with the homemade device.
The youth was not identified, but Bjornland said intelligence agencies were aware of him.
![Police respond after a "bomb-like device" was found in Oslo on Saturday.](/web/20170425154734im_/http://www.canberratimes.com.au/content/dam/images/g/v/g/y/g/1/image.related.articleLeadwide.620x349.gvgych.png/1491753403623.jpg)
Bjornland said he was an asylum-seeker from Russia who arrived in Norway in 2010.
Norway intelligence agency said the country's terror threat level would be increased for a two-month period.
Oslo's bomb squad set off a controlled explosion of the "bomb-like" device after it was found near the city's Groenland area on Saturday.
The device had appeared to be capable of causing only a limited amount of damage, the police said.
The Groenland area, a multi-ethnic neighbourhood 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 kilometre away from where the device was found.
In neighbouring Sweden, a truck on Friday ploughed into crowds in Stockholm, killing four people and wounding 15 in what police said was an apparent terror attack.
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.
Reuters