Two bombs that went off on a railway track in the Republic of Dagestan in Russia's troubled North Caucasus region had the force of 6 kg in TNT equivalent, the Federal Security Service said on Sunday.

The blasts occurred in the early hours on Sunday near the Inchkhe station in Dagestan's Karabudakhkent district near the capital Makhachkala, derailing the locomotive and eight carriages of a freight train. No one was hurt in the incident.

"The power of the explosive that went off under the locomotive was 5 kg in TNT equivalent. Some 5-6 meters away from the explosion site, a second bomb (a trap) with the force of 1 kg in TNT equivalent went off," a spokesman for the Dagestan branch of the Federal Security Service said.

Passenger train traffic along the railway line running to the former Soviet republic of Azerbaijan via Dagestan has resumed after several hours of suspension, railway officials said.

The bomb attack occurred just days after two suicide bombings in the Dagestani town of Kizlyar killed 12 people and left 29 others injured.

MAKHACHKALA, April 4 (RIA Novosti)