On 13 May, 2018 a series of sucide bomb attacks were carried out in Surabaya targeting 5 churches. 3 out 5 Churches were affected by the detonation, the other 2 churches were not affected due to failure of explosion. The attacks were all carried by the same family. The successful attacks were carried out on GKI, STMB, and GPPS church. The failed attacks were carried on Saint Jacobs Church, and HKY cathedral. The attacks were done through driving in with a motorcycle and walking into the building. On the day of the attack 25 people were killed, 13 of them were the attackers themselves, dozens of others were injured. Investigators found undetonated homemade bomb at the two unaffected churches. The family’s motive is assumed to be caused by joining Isis in Syria, the family returned to Indonesia in 2017.