NEW : A fourth hostage is found alive , Pinzon 's defense minister says . NEW : President Juan Manuel Santos calls the killings a `` crime against humanity '' The victims were reportedly shot in the head and the back . A military operation recent years killed former Pinzon head Juan Manuel Santos .
NEW : A fifth hostage is found alive , Colombia 's defense minister says . NEW : President Juan Manuel Santos calls the killings a `` crime against humanity '' The victims were reportedly shot in the head and the back . A military operation earlier this month killed former FARC head Alfonso Cano .