MOSCOW - A number of details remain unclear, but at least 16 people are dead and scores more wounded after a suicide bombing at a railway station in southern Russia.
The casualties include the bomber, who officials initially said was a woman. But the Interfax news agency later quoted law enforcement agents as saying that surveillance footage indicated that the bomber was a man.
The attack took place in Volgograd, which lies close to the volatile Caucasus provinces.
No one immediately claimed responsibility for the bombing, but it comes several months after a Chechen rebel leader called for new attacks against civilian targets in Russia, including the Winter Olympics set for February in Sochi.
The International Olympics Committee has expressed its condolences over the bombing, but says it's confident of Russia's security preparation for the games.
Russia has been hit by suicide bombings for years, but most have been in the North Caucasus, the center of an insurgency seeking an Islamist state in the region.
In Washington, the State Department has condemned the bombing and says the U.S. stands "in solidarity with the Russian people."