SURABAYA (East Java province) - Four men were shot dead on Wednesday (May 16) after they launched an attack using samurai swords on the Riau provincial police headquarters in Pekanbaru, local media reported. The attack left one police officer dead and two others injured.

The incident took place at around 9am, when a white MPV crashed into the gate of the police headquarters.

"Four masked men rushed out of the car and attacked the officers using swords," national police spokesman Setyo Wasisto told reporters in Jakarta. The fifth suspect who fled was was later arrested, he added.

Police retrieved three swords, five face masks and a video camera.

Indonesia is still reeling from the shock of a series of suicide bombings in recent days.

On Monday, a family of five, including an eight-year-old child, mounted a suicide bombing at the Surabaya police headquarters, injuring 10 people.

On Sunday, coordinated suicide bombings at three churches carried out by a family of six claimed 12 lives in Surabaya, the country's second-largest city.