The explosion took place at 08:20 am local time at the Astana Anyar sub-district's police station and caused damage, Bandung police chief Aswin Sipayung said.
"The bomber came into the police station when the policemen were having a regular ceremony. The bomber pointed a knife at the policemen. Then an explosion happened," he told local media.
Police were carrying out an investigation at the scene, he said.
(With UNI inputs)