By The Nation
The source said police are looking for Miles Dicken Turner, who holds a British passport, and Abel Caldeira Bonito, who holds a South African passport.
The two were found to have registered their names to rent a white motorcycle seen on security cameras as being used by the gunman.
The unidentified gunman shot and killed Tony Kenway, 39, on Tuesday.
The source said Turner entered Thailand for the first time on November 25 at the Suvernabhumi Airport and left Thailand on November 26. He re-entered Thailand on January 19 through an immigration checkpoint in Trat and left Thailand again via the same Trat checkpoint on January 24.
Bonitor entered Thailand for the first time on January 19 through the Trat border checkpoint and left the kingdom via the Trat checkpoint on January 24.