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Volgograd bus bomb blast kills five Russia bus bomb: Volgograd blast kills five
(35 minutes later)
An explosion that killed at least five people on a bus in the southern Russian city of Volgograd was caused by a bomb, Russia's National Anti-Terrorism Committee has said in a statement.An explosion that killed at least five people on a bus in the southern Russian city of Volgograd was caused by a bomb, Russia's National Anti-Terrorism Committee has said in a statement.
The blast, which happened just after 14:00 local time (10:00 GMT), injured more than a dozen people. The blast, which happened just after 14:00 (10:00 GMT), also injured more than a dozen people, some seriously.
Cities further south, in Russia's North Caucasus, have seen attacks by Islamist militants in recent years. Investigators suspect a female suicide bomber, Russian news agencies report.
There may be fears of a link with the Volgograd blast, correspondents say. Cities to the south, in Russia's North Caucasus, have seen attacks by Islamist militants in recent years.
'Criminal case'
It is believed there were 40 people on board the bus, the BBC's Steve Rosenberg in Moscow reports.It is believed there were 40 people on board the bus, the BBC's Steve Rosenberg in Moscow reports.
Explosives experts are currently on the scene sifting through the wreckage, our correspondent adds. Explosives experts are currently at the scene sifting through the wreckage, our correspondent adds.
So far, there has been no information about who might have carried out the bombing, he says. Vladimir Markin, of the Investigative Committee - Russia's equivalent of the FBI - told the RIA Novosti news agency: "A criminal case has been opened under articles outlining terrorism, murder and the illegal use of firearms."
Earlier reports had suggested the blast may have been caused by an exploding gas canister.
Volgograd lies about 900km (560 miles) south of Moscow.
President Vladimir Putin has stepped up security in the North Caucasus ahead of the 2014 Winter Olympics, which open in the Black Sea resort city of Sochi on 7 February.
Separatists in Chechnya have fought two wars with Russian forces over the past two decades.
But the violence has spread across the North Caucasus in recent years, including to mainly-Muslim Ingushetia and Dagestan.
Hundreds of people, including members of the government and security services, have been killed.