Three policemen on mission in Ingushetia were injured in a bomb blast on the Caucasus federal highway, Itar-Tass quoted a source in the Ingush investigation committee of the Russian Prosecutor General's Office as saying on Wednesday. When an UAZ vehicle with the policemen inside was driving on the Caucasus federal highway an unidentified homemade bomb exploded on the roadside at 11.20 a.m. Moscow time on Wednesday. Three policemen were slightly injured and hospitalized. The UAZ vehicle was damaged. The search for the bombers is underway.