Badung, Bali, March 5 -- The Ngurah Rai Immigration Office in Bali is assisting police in monitoring the movements of foreign nationals suspected of involvement in the kidnapping of a Ukrainian citizen, authorities said Wednesday.

"Four people passed through immigration checkpoints, and two of them are still in Indonesia," Ngurah Rai Immigration Chief Bugie Kurniawan said on March 4.

The office has been coordinating closely with the Bali Regional Police to support the investigation into the suspected kidnapping of Ukrainian national Ihor Komarav.

Kurniawan said immigration officers have been assigned to assist investigators and maintain intensive communication with police regarding the suspects' border crossings and residence permits....