I was at work 3 blocks away from the bombing. If there were several bombings, they were detonated simultanously. I heard a single bang and our building shook once.
I'll add that the blast was unlike anything I've withnessed, even 3 blocks away.
It was only a single explosion. There were rumours of multiple explosions, but they were not true. People mistook glass falling from buildings and fake CG YouTube videos (Sky News retweeted it), but the rumors were quickly denied in the Norwegian media.
I'll add that the blast was unlike anything I've withnessed, even 3 blocks away.