On May 15, the National Police's Densus 88 counterterrorism squad found in a raid a total of 54 pipe bombs at the home of Tri Murtiono.
Murtiono is the man who had led his family in a suicide bombing of the Surabaya Police headquarters on May 14.
The homemade explosives were active and ready to be detonated, Surabaya Police chief Sr. Comr. Rudi Setiawan said.
"We have found a number of active bombs. Those 54 bombs are being disposed detonated," Rudi confirmed, as quoted by Jakarta Post.
To attack the Surabaya Police headquarters, Tri and his wife Tri Ernawati had brought their three children along. One child who survived is being treated for her injuries.
The bombing followed a string of terror attacks on churches in the East Java provincial capital.
On May 13, a family including their four children carried out suicide attacks on three churches in Surabaya, killing at least five people and injuring many others.
The attackers included two daughters aged 9 and 12 years old. All of the six bombers died.
It is believed that the parents belong to Jamaah Ansharut Daulah, a terrorist group that supports Islamic State of Iraq and Syria (ISIS) in Indonesia.
The ISIS claimed responsibility for what it called "martyrdom attacks" in the port city on the east coast of Java Island, through its Amaq News Agency. But they didn't provide any proof to substantiate its claim.
The family involved in May 13 bombings are believed to have studied in the same Quran group as Tri and his family.
Indonesia is the world's most populous Muslim country which has been struggling with a rise in Islamist militancy.
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