AS a series of bomb blasts rocked Russian cities over a week, killing over 300 people, the feeling that the trail leads to the war- torn North Caucasus is gaining hold. On September 16, a truck exploded outside a nine-storey apartment block in the southern city of Volgodonsk, near the volatile mountain region of Dagestan where Russian troops are fighting Islamic rebels. At least 13 people were killed, over 115 injured and many trapped inside the debris.