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Indonesian police have secured a fourth unexploded bomb.

Media reports said at one church, a woman with a younger child and a teenager was being questioned by security when the bomb exploded.

Police have confirmed the explosions all occurred within 10 minutes of each other.

The first bombing happened at around 7.30am local time.

Police have only given details of one attack on Santa Maria Catholic Church and there have not yet been any claims of responsibility.

Frans Barung Mangera, East Java police spokesman said: "The victims are being identified."

He added: “We have confirmed one died at the scene, one died at the hospital, two police officers were injured and there are some civilians injured.

“In total 13 people are being treated at the hospital.”