The number of dead is not really confirmed as of now. though the explosion did demolish an entire apartment building.
www.youtube.com/watch?v=ROrpKx3aIjA&feature=youtu.bec
the video does not have the old code to embed. The explosion filmed by a father with his daughter. Pretty scary, the girls reaction well. Makes it real.
The explosion was equivalent to a 2.1 richtor scale earthquake.