A suicide bomber on a motorcycle attacked a police station in the small Indonesian city of Solo on Tuesday, killing himself and wounding a police officer, a police spokesman said.
Shortly after the attack, President Joko Widodo, who is from Solo and a former mayor of the town, ordered police to arrest others that may have been connected to the suicide bomber.
"I have asked the police chief to chase down the network and uncover who is the suicide bomber," the president told reporters. "We hope for the people to remain calm in this last fasting day. No need to be scared."
Police said the attacker detonated the bomb he was wearing shortly after driving into the grounds of the police station in Solo, known as a hotbed for religious fundamentalism. A police officer who tried to stop him from entering sustained minor injuries.
The identity of the bomber was not immediately clear, but intelligence chief Sutiyoso told MetroTV he suspected the attacker was a supporter of Islamic State.