On 14 May, a family of five riding on two motorcycles detonated improvised explosive devices (IEDs) at the gate of the Surabaya Police Headquarters in Surabaya in East Java province, killing themselves and wounding 10 others.
This was the third incident in East Java in two days. On 13 May, a family of six affiliated with the pro-Islamic State Jamaah Ansharut Daulah (JAD) militant group detonated IEDs at three churches across Surabaya, killing eight people and injuring 41 others. Later that day, premature IED explosions attached to a motorcycle in Sidoarjo town killed three members of a family. Although the Indonesian police said that the family attacking the churches included returnees from Iraq and Syria, it later retracted that statement and offered no indication of affiliation of other perpetrators.
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