In pictures: Karachi explosion

1 of 6 The blast at the Shia mosque in Karachi's business district left a scene of carnage and devastation.

2 of 6 Those hurt were moved to safety and taken to hospital - many of them critically injured.

3 of 6 Police quickly cordoned off the area and have begun an investigation.

4 of 6 Many of the mosque's internal decorations and fittings were severely damaged by the explosion.

5 of 6 Wondering where to begin the clear-up amid the extensive damage.

6 of 6 One group of volunteers tries to salvage some fittings.