KUALA LUMPUR, Malaysia (AP) — A man stormed a police station in Malaysia and killed two police officers early Friday in what’s being investigated as a Jemaah Islamiyah terror attack. The man also injured another officer before being shot dead.

Material linked to Jemaah Islamiyah, a shadowy Southeast Asian terror network that is linked to al-Qaida, was found in the attacker’s home and five members of his family believed to be JI members were arrested for investigation, national police chief Razarudin Husain said.

The attack in southern Johor state appeared to have been planned and though the motive was unclear, it could have been an attempt to take firearms from the station, the police chief said.

Two students also were detained after they turned up at the police station just before the attack, purportedly to lodge a complaint, Razarudin said. He said the timing of their appearance was suspicious and could have been an attempted diversion.