Advertisement Oslo Explosion Rocks City Center, Police Discover Unexploded Grenade.A loud explosion shook central Oslo on Tuesday night. Police quickly cordoned off the area near Parkveien and Pilestredet. They discovered an unexploded hand grenade at the scene.Authorities sent emergency alerts to residents, warning them to stay away from windows. According to the Norwegian news agency … Continue reading Oslo Explosion: Police Find Grenade at Blast Scene