ATF is looking at ties between American and hand grenades used in shootout in Mexico . Score: 6 Kingrey is on trial in Mexico for allegedly importing grenade parts , selling devices to cartels .
ATF is looking at ties between American and hand grenades used in shootout in Mexico . Agents say explosives bear signature of operation run by Jean Baptiste Kingrey . Kingrey is on trial in Mexico for allegedly importing grenade parts , selling devices to cartels .