Explosion of gas pipe-line on Chechen-Dagestani border

A blast at a gas pipe-line occured on Friday on border of Dagestan and Chechnya in Shelkovskoi region, reports RIA Novosti, citing Dagestani Emergency Ministry’s spokesman.
“An explosion occurred on a spur-line of a cross-country pipe-line,”- he said. 
As a result of explosion fire started. The cause of the blast is unclear yet.