Four unnamed foreign criminal suspects — three Indonesian nationals and one Vietnamese national — have been detained in Bangkok in connection with an abduction case involving an Indonesian victim, the Immigration Bureau said on Thursday.

A video clip received by the abducted man's family showed the abductors cutting off his finger and making a demand for a ransom of over 300,000 baht, said Atchayon Kraithong, chief of the bureau’s Division 3.

The abduction case has come as a shock to those in Indonesia, said Pol Maj Gen Atchayon.

On Sunday, the suspects had entered Thailand at an immigration checkpoint in Sa Kaeo province, which prompted a car chase from Sa Kaeo to Bangkok, he said.

The suspects were aware they were being chased and they managed to switch to a different public van to avoid being caught at a special checkpoint set up to stop them, he added.

The authorities later located the suspects at a hotel in the downtown Pratunam area of Bangkok, he said.

The four were later handed over to the Cambodian police.