"The bombing in Flawless St. Mary Church was conducted by two perpetrators, who were the sons of D and PK," Tito said.

Tito said the family belonged to Jamaah Ansharut Daulah (JAD), a radical group which has stated its allegiance to the Islamic State (IS) group.

Tito said that police could not do much against the bomber family soon after they arrived in Indonesia from Syria as the existing terrorism law does not justify legal measurement against them.

"They went to Syria, joined the IS and returned to Indonesia. While they were with IS in Syria, they learned terror strategies, undergone military drills and how to assemble bombs," Tito said.

Tito urged immediate completion of the terrorism law revision whose discussions now stumbled in the parliament after being submitted in 2016.

"It has been more than a year now. We already knew their cells, but we cannot do anything against them," Tito said, referring to the period of stalemate of process in the parliament to enact the revised terrorism law.

Tito said that terrorists' sleeping cells in Indonesia now started to wake up following the recent riot incited by terrorist inmates in police's high security prison that killed five police and one terrorist.

In the latest development related to the awakening of terrorist sleeping cells, four terrorist suspects were killed in a gunfire exchange with police in West Java province regency of Cianjur on early Sunday.

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