Six family members, including girls aged nine and 12, died while carrying out the attacks, which Indonesian President Joko “Jokowi” Widodo described as “cowardly actions” that were “barbaric and beyond the limit of humanity.”
Isis claimed responsibility for the bombings, which occurred just minutes apart in Indonesia’s Surabaya district.
Police chief Tito Karnavian explained that the father had detonated a car bomb while his two sons carried out a bomb attack on motorcycles. The two young girls were strapped with explosives and accompanied by their mother.
Mr Karnavian said the family had recently returned to the country from Syria, where they are believed to have lived in Isis-controlled territory.
He named the father as Dita Futrianto, head of the Surabaya cell of Jemaah Anshorut Daulah, an Isis-affiliated group that has been responsible for a number of recent attacks in Indonesia.
The Indonesian Church Association expressed anger over the attacks but urged people to wait for the results of the police investigation. Indonesia’s largest Muslim associations, Nahdlatul Ulama and Muhammadiyah, also condemned the bombings.
Isis has increased activities across Indonesia, with four suspected militants shot and two arrested in West Java on Sunday.
The bombings are the worst attack claimed by Isis in Indonesia, although an 2002 al-Qaida bomb attack on the island resort of Bali killed more than 200 people.
Placing the country on high alert, Mr Widodo said he had ordered police to “look into and break up networks of perpetrators.”
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