At approximately 1030 local time (0230 UTC) on 28 March 2021, a suicide bombing occurred outside of a crowded Catholic church in the city center area of Makassar, located on Sulawesi island, during a Palm Sunday Mass. One of the two attackers, who arrived on a motorcycle, detonated his explosives near the main entrance of the cathedral when security personnel prevented the duo from entering the compound. The explosion killed both attackers and wounded at least 20 people, including churchgoers and four security guards. Authorities believe the assailants — a newlywed couple who received online training for manufacturing bombs — were members of the Jemaah Anshorut Daulah militant group, which has pledged allegiance to Islamic State.