AlHijjah 16, 1434, Oct 21, 2013, SPA -- Russian emergency officials say an explosion on a passenger bus in the southern city of Volgograd has killed at least five people and injured 17 others. Irina Gogolyeva, a spokeswoman for the Emergency Situations Ministry, says the cause of the blast has not yet been determined. She said 40 people were on the bus when the explosion occurred on Monday afternoon, according to AP.