Three attacks, including one by a suicide bomber disguised as a churchgoer, targeted three churches in Indonesia's second largest city of Surabaya, killing at least three people and wounding more than 10 others.
"The victims are being identified", Frans Barung Mangera, an East Java police spokesman, said, cited by Reuters.
A woman was killed and two people were injured in a second blast at the GPPS Pentecostal church 30 minutes later.
It is not known if there were casualties at the two churches apart from Santa Maria.
"We have confirmed one died at the scene, one died at the hospital, two police officers were injured and there are some civilians injured", Mangera added.
Bombs at crowded nightspots on the resort island of Bali kill 202 people, mostly foreign tourists, in Indonesia's worst-ever terror attack.
The attackers, disguising as followers of the morning sermon in the churches, detonated bombs which hit scores of followers, said the police spokesman.
Images from the sites showed debris scattered around the entrance of a church as crowds gathered around. The Islamic State group has claimed responsibility.
Indonesia is the most populous Muslim-majority country in the world, but also has sizable numbers of Christians, Hindus and Buddhists. Human rights groups, however, have raised concerns in recent years over rising religious intolerance.
The wave of bombings follows a riot by convicted terrorists who captured and executed five police officers and guards at a maximum-security prison on the outskirts of Jakarta.
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