Indonesian police shot dead four men on Wednesday (May 16) after they used samurai swords to attack officers at Riau police headquarters in Pekanbaru, Sumatra, a police spokesman said.
The perpetrators in the sword attack on the police headquarters of Indonesia's Riau province on Wednesday have links with the Islamic State (IS), a police officer said.
Two officers were wounded in the attack, while another was killed after one of the perpetrators tried to escape and crashed into the officer, he said.
Earlier, an internal police report said that one of the dead men had a suspected bomb strapped to his body. Another man was arrested and four others were suspected to have fled the scene, it said.
No group has taken responsibility so far.
In the ensuing chaos, at least two suspected terrorists, both wearing balaclavas, were spotted getting out of the auto wielding sharp weapons and attacking police officers.
The attack comes days after over two dozen people were killed in a series of terrorist strikes in Indonesia, including suicide bombings by a family of six in three churches on Sunday in the islands second largest city, Surabaya.
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Most attacks in recent years have been limited to low-level operations against domestic security forces.
The police shot two of them, Doddy said.
Police suspect they were carried out by a cell of the Islamic State-inspired group Jemaah Ansharut Daulah (JAD), an umbrella organisation on a US State Department terrorist list that has allegedly drawn hundreds of Indonesian sympathisers of Islamic State.
According to reports from journalists at the scene, who were covering another story right before the attack, a white Toyota Avanza smashed into the outer fence of the police headquarters.
The radical group supports Islamic State, whose ambitions have been reined in after losing most of the land it once occupied in Iraq and Syria.
A police officer was killed and one of the assailants arrested.