Explosions, Smoke Rising From Nairobi Mall in Third Day of Terrorist Siege

Two militants reportedly dead--10 to 15 militants holding an unknown number of hostages

Powerful explosions sent thick smoke billowing from the Nairobi mall where militants from Somalia's al Qaeda-linked al Shabaab group threatened to kill hostages on the third day of a raid in which at least 59 have already died.

The blast was followed by other smaller detonations and volleys of gunfire but there was no indication of the fate of people whom the authorities say are being held by 10 to 15 Islamist gunmen who took the complex by storm on Saturday.