Iimbestigahan ng Philippine National Police (PNP) ang report na hindi pumutok ang ilang bala ng grenade launcher ng Philippine National Police-Special Action Force (PNP-SAF) troopers habang nasa kainitan ng engkuwentro sa Mamasapano.br br br Subscribe to the ABS-CBN News channel! - br Watch the full episodes of TV Patrol on TFC.TV br and on IWANT.