Overview

• An explosion was reported Tuesday night in central Oslo near Pilestredet and Parkveien, and police cordoned off the area.
• Authorities said an undetonated hand grenade was found at the scene and the bomb squad responded.
• The emergency alert warned there could be additional explosive devices and stated there was no evacuation at the time.
• Witnesses told NRK the blast was extremely loud, and a report of a hooded person running from the scene remains unconfirmed.
• Tram service near the site was halted and police helicopters were deployed as emergency crews continued clearance work.