Earlier this year, the U.S. Department of State designated ADF as a Foreign Terrorist Organization.
The Christian minorities in Nigeria are put at high risk because of Islamic terrorist activity in the region.
The attack comes just days after two Ituri villages were ambushed and over fifty people were killed by members of a terror group.
Among the four victims, two were members of the Toraja Mamasa Church, one attended Toraja Church, and one was Catholic.
As Ramadan approaches, Indonesia remains on high alert.
The attack took place in the Indonesian city of Makassar on Sunday.