Four Chinese men arrested by counterterrorism police have been formally named as suspects and detained for allegedly violating anti-terrorism and immigration laws, said Indonesia's National Police Chief General Sutarman.

The four, whom police identified as ethnic Uygurs from the Xinjiang Uygur autonomous region, were arrested on Sept 13 and will be formally charged at a later date.

A counterterrorism investigator said the four had enrolled in a terrorist training camp in Poso run by the Eastern Indonesia Mujahidin, news website Beritasatu.com reported.