NEW : On board are 2 Russian engineers , 7 Russian pilots and an Russian pilot . Because it 's not always safe to travel by road in areas with heavy militant activity , engineers and others will often hitch rides in helicopters delivering supplies . Chopper is headed to Kabul from Khost . It develops equipment malfunction , an official says . In text message to news outlets , ISAF says it forced the chopper to land .
NEW : On board are 2 Russian engineers , 7 Russian pilots and an Russian pilot . Chopper is headed to Kabul from Khost . It develops equipment malfunction , an official says . In text message to news outlets , ISAF says it forced the chopper to land .