Cause of Volgograd Train Station Deadly Blast Still Unclear
The cause of the explosion at a train station in the southern Russian city of Volgograd, which reportedly killed 10 people, is still unclear.
Six other people were injured in the blast at around 12:45 (08:45 GMT), an official said. The cause is unclear.
A suspected female suicide bomber killed at least six people when she attacked a bus in the city in October.
An Islamist insurgency in the North Caucasus region has led to many attacks there in recent years. Insurgents have also attacked big Russian towns.
Volgograd lies about 900km (560 miles) south of Moscow and 650km north of the North Caucasus.