A group of three Indonesian fishermen were abducted during curfew hours early on Tuesday morning in Semporna, Sabah, Malaysia.

The victims were with a Malaysian fisherman on a fishing vessel tied up at Semporna’s Pulau Gaya jetty when they were kidnapped at about 1am, Datuk Omar Mammah, acting police chief of Sabah, said in a report from The Star.

Police said that when the local fisherman saw two masked and armed men board his boat, he hid himself in a compartment. The suspects were said to be speaking the Suluk dialect—which is a dialect used in the Philippines, Channel News Asia reported.

At 2am, the Malaysian came out of his hiding place and called the police to report that his crew were missing. The police chief said no ransom demands had yet been made.

The kidnappers were reportedly armed with M16 assault rifles. A curfew from 6pm to 6am was introduced in Semporna in 2013 after some tourists were kidnapped while diving in Sabah.