Police are currently investigating a grenade found beneath the vehicle, to see whether the explosive is live. Investigators initially suspected a gas explosion to be the cause. -- An explosion that ... more 
Police are currently investigating a grenade found beneath the vehicle, to see whether the explosive is live. Investigators initially suspected a gas explosion to be the cause. -- An explosion that killed at least five people on a bus, is thought to have been caused by a female suicide bomber, Russian news agencies report. (Demotix/Corbis) less 
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Yahoo News | Photo By Demotix/Corbis
Mon, Oct 21, 2013 3:00 PM EDT