NEW : Authorities did not identify Ampatuan as a suspect . Datu Unsay mayor led group that initially stopped civilians , police cite reports as saying . A car traveling behind the convoy was mistaken for being a part of the politician 's contingent , a local official told the Philippines GMA News Network . Comment: Authorities disband paramilitary force in the southern Philippines .
NEW : Authorities did not identify Ampatuan as a suspect . Datu Unsay mayor led group that initially stopped civilians , police cite reports as saying . Comment: Authorities disband paramilitary force in the southern Philippines .