NEW : Authorities did not identify Robles as a suspect . Defense mayor led group that initially stopped civilians , police cite reports as saying . Christian hold leadership positions in Philippines . Ampatuan family members have not commented on the slaying allegations . Authorities disband paramilitary force in the southern Mindanao .
NEW : Authorities did not identify Robles as a suspect . Defense mayor led group that initially stopped civilians , police cite reports as saying . Christian hold leadership positions in Philippines . Authorities disband paramilitary force in the southern Mindanao .