Second attack on Russia caused by suicide bomber, toll up to 14

Members of the emergency services work at the site of a blast on a trolleybus in Volgograd in this December 30, 2013 handout photo. The bomb blast ripped a trolleybus apart in Volgograd on Monday, killing at least 10 people in the second deadly attack in the southern city in two days and raising fears of further violence as Russia prepares to host the Winter Olympics. REUTERS

A deadly bombing on a packed trolleybus in the Russian city of Volgograd was caused by a male suicide bomber, investigators said today, as the official death toll rose to 14 people.

"The explosives were detonated by a male suicide bomber, fragments of whose body have been found," the Investigative Committee said, adding that the kind of explosive used showed the trolleybus attack and a deadly strike yesterday on Volgograd train station could have been jointly planned.

Health ministry spokesman Oleg Salagai told Russian state television that 14 people were killed in the trolleybus bombing and 28 wounded.

President Vladimir Putin ordered security stepped up across all of Russia after bombings, the national anti-terror committee announced.

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