An explosion in central Oslo has caused disruptions as police detonated a grenade and arrested a man. Norwegian authorities are investigating the incident and have warned the public to stay away as more explosives may be present. Drones were seen flying over Oslo’s city center, where police conducted a controlled detonation. Residents were notified of the blast through mobile phone alerts, advising them to avoid windows due to the presence of an explosive device. The detonations occurred near a university campus, with no reported injuries. Police discovered a hand grenade and other undetonated devices at the scene, believed to have been left on a tram line. Witnesses described the explosions as loud and alarming, with one resident recalling a hooded individual fleeing the area. The incident follows previous drone sightings over the Akershus Fortress, resulting in arrests. Additionally, autonomous UAVs were detected over Copenhagen Airport, leading to a temporary closure. Oslo’s Fire and Rescue Service assisted the police at the scene. Stay updated on this developing story through various news platforms or visit The Mirror homepage for more information. Sign up for email alerts to receive the latest updates.