(CNN) — Another deadly blast has struck the southern Russian city of Volgograd, killing at least 14 people and further highlighting Russia’s security challenges as it readies to host the Winter Olympics in less than six weeks.
Like Sunday’s attack, the blast Monday was a terrorist act, Vladmir Markin, a spokesman for the country’s federal investigation agency, told the state-run news agency RIA Novosti.
No one claimed responsibility for the explosions. But they come several months after the leader of a Chechen separatist group pledged violence to disrupt the 2014 Sochi Winter Olympics.
Two blasts in two days
Video footage from the scene Monday showed the twisted shell of the blue trolleybus, with debris spread around it. The impact of the blast blew out the roof of the bus, as well as windows of several nearby houses. At least 28 people were reported to be wounded. Several are in serious condition, including a 6-month-old baby, RIA Novosti reported.
Based on the footage, the blast appeared to have occurred in the back half of the bus. The federal investigation agency said it believes the explosion was set off by a male suicide bomber.
And there are strong indications the two attacks are linked, the agency said.
Investigators said the train station blast Sunday appeared to have been caused by a suicide bomber, who may have been female.