At least 10 people died when a bomb exploded on a trolleybus in the Russian city of Volgograd on Monday, officials said.
In a second deadly attack in two days, dozens of people were injured when the trolleybus exploded as it was entering the tracks.
Police are investigating the blast, which authorities said was possibly a terror attack, as it came less than 24 hours after a suicide bombing on a train station in the same city on Sunday.
Reports said the Sunday attack on a train station killed up to 17 people.
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