This handout photo released by the Presidential Palace on May 13 shows Indonesia President Joko "Jokowi" Widodo (left), National Police chief Gen. Tito Karnavian (center), Coordinating Political, Legal and Security Affairs Minister Wiranto (second left) and Armed Forces chief Hadi Tjahjanto (second right) at the scene of an attack outside the Surabaya Pentecostal Church (GPPS) in Surabaya. A series of blasts struck three churches in Indonesia on Sunday, killing at least 13 people and wounding dozens in the deadliest attack in years in the world's most populous Muslim-majority country. (AFP/Presidential Palace)

Another bomb explosion occurred near a police station in Siduarjo of East Java province on Sunday evening, a police officer said.

The explosion took place behind Taman police station in Siduarjo, spokesman of provincial police Senior Commissioner Frans Barung was quoted by local media as saying.  

 An eyewitness named only Punguh said that the blast occurred at a dormitory building.

"The explosion has just happened at the higher floor, its sound was not strongly heard," he said.