Representational imageAn explosion rocked Pilestredet in downtown Oslo, likely caused by a thrown hand grenade. Emergency services have been called to the scene in central Oslo, with armed police shutting down roads and firefighters on standby. Residents in the area have been advised to stay away from windows and avoid visiting the location altogether. Nearby trams have been evacuated, and reports suggest the wider tram network across the city has been disrupted. Authorities continue to investigate the situation and urge the public to stay clear of the area until further notice.