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Volgograd bus blast: Southern Russia explosion kills four Volgograd bus blast: Southern Russia explosion kills six
(34 minutes later)
An explosion has ripped through a bus in the southern Russian city of Volgograd, killing at least four people and injuring seven. An explosion has ripped through a bus in the southern Russian city of Volgograd, killing at least six people and injuring seven.
The cause of the blast is not yet known, Russian officials say. The cause of the blast, which happened just after 14:00 local time (10:00 GMT), remains unclear.
Cities further south, in Russia's North Caucasus, have seen attacks by Islamist militants in recent years. Cities further south, in Russia's North Caucasus, have seen attacks by Islamist militants in recent years; the blast on Monday may be linked.
There may be fears of a link with the Volgograd blast, correspondents say. Another possibility is that a gas canister exploded on the bus. But it may have been caused by a technical malfunction, reports suggest.