Suicide bombers attacked three church buildings in Indonesia early Sunday, killing no less than six individuals and wounding greater than 35 others, police and media reviews mentioned.
Forty-one people - including two police officers - are in hospital being treated for injuries following suspected terrorist attacks in Surabaya, a port city on the east coast of Java Island, East Java Police spokesman Frans Barung Mangera said.
One of the injured died in the hospital, bringing the total death toll to 9.
The blast was followed by a second explosion minutes later at the Christian Church of Diponegoro and a third at the city's Pantekosta Church.
Two other attempted attacks were also reported at two other churches. The Daesh terror group had claimed responsibility.
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Purwanto said the attacks are likely linked to a riot and a 36-hour standoff at a prison near Jakarta last week, when Islamic State loyalists killed at least five security officers, according to Al-Jazeera and Reuters.
Separately, an internal police report reviewed by Reuters said a suspected bomb exploded in a auto in the parking lot of a Pentacostal church, setting alight dozens of motorbikes.
Television images showed debris scattered around the entrance of one church and police cordoning off areas as crowds gathered.
Indonesia is the world's most populous Muslim country with more than 82% of its roughly 260,500,000 people following Islam. In the recent years, extremists have targeted Christians and other minorities through a series of attacks.
A sustained crackdown weakened the most unsafe networks but the emergence of IS has proved a potent new rallying cry for radicals.
A gun and suicide attack in the capital Jakarta left four attackers and four civilians dead in 2016, and was the first assault claimed by IS in Southeast Asia.