Female bomber behind blast… Investigators said the train station blast Sunday appeared to have been caused by a suicide bomber, who may have been female.
The station bomber, who used the equivalent of 10 kilograms (22 pounds) of TNT in a device containing shrapnel.

Investigators say they also found an unexploded grenade at the scene.
Video taken from an outside security camera shows a huge fireball inside what appears to be the main entrance of the three-story stone building, followed by a steady trail of smoke coming out of shattered windows.