Police say a family -- including children -- was responsible for the attacks, which targeted three churches and the worshippers.
Indonesia's president has ordered a full investigation into the roots of the organisation allegedly involved.
One family blamed for series of suicide bombings in Indonesia
Police at the scene of one of the Surabaya bombings Source: AAP
Indonesian officials say at least 13 people are dead and dozens injured after a series of suicide-bomb attacks on Christians in the country's second-largest city.
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