Some 15 million people worldwide are denied basic rights because they lack legal nationality. Thailand, which has one of the world's largest stateless populations, is trying to tackle the problem.
Thailand's police chief did not offer details about who else might be involved in the deadly attack, though they asserted that Thai citizens were involved. At least 20 people died in Monday's bombing at a shrine.
Thousands of Rohingya Muslims are fleeing by sea from Myanmar, abetted by human smugglers whose crews later abandon ships mid-crossing. The surge in sea crossings has led to finger pointing among neighboring countries.