Series of explosions in the South of Russia

Two women killed and several people injured in a series of explosions in southern Russia close to Chechnya. One woman died when two bombs exploded at a railway station in Pyatigorsk. Three others were injured in the blast. In Nevinnomyssk one bomb exploded at a bus stop near the main administrative building and another went off in a market, leaving one woman dead and 20 people wounded. Pyatigorsk and Nevinnomyssk are about 100 km apart. According to Russian news agencies four people have been arrested for their involvement in the attack. Several explosions in Russia have been linked to rebels fighting in Chechnya, BBC reports.