Two servicemen of the Russian Interior Troops were injured in a bomb blast in Chechnya, a source in the republican law enforcement agencies told Itar-Tass on Tuesday. "The bomb explosion went off on Monday morning three kilometers away from the district center Shali. An unidentified explosive device detonated on the roadside when servicemen were being on a combat engineer reconnaissance party," the source said. The yield of the blast amounted to 700 grams of TNT, the source said. Two servicemen were injured in the blast and were hospitalized. The investigation into the blast is underway.