TBILISI, October 21 (RIA Novosti) - Twelve cars of a freight train carrying fuel oil blew up in western Georgia early on Wednesday after unknown attackers detonated a bomb, but no casualties have been reported.

Rustavi 2 TV said the blast occurred on the Tbilisi-Poti line in the Samegrelo region. When the fuel ignited, the force of the blast shattered windows in nearby homes and damaged electric power lines.

"About 150 meters of the track was damaged, and 12 cars were derailed," Georgian Railway co. General Director Irakly Ezugbai was quoted by the channel as saying.

Cleanup efforts and repairs are underway, and an investigation has been launched. Preliminary reports said TNT was used as an explosive, the channel said.

The incident is the fifth railroad explosion in the region in the past five months. No one has died in the blasts, and no information on the attackers has been reported.