At least nine persons were killed and 35 others injured as suicide bombers blew themselves up on Sunday during congregations in three churches in Surabaya city, capital of Indonesia's East Java province, officials said.
The attacks occurred within minutes of each other. No group has so far claimed the responsibility, BBC reported.
The attackers, disguising as followers of the morning sermon in the churches, detonated bombs which hit scores of followers, said the police.
The police have cordoned off all the scenes for investigation, said Barung.
Indonesia, the most populous Muslim-majority country, has seen a resurgence of Islamist militancy in recent months.
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