Undocumented migrants were arrested in large-scale exercises yesterday to prevent them from sneaking out of enhanced movement control order (MCO) areas, said national police chief Abdul Hamid Bador.

"We cannot allow them to move freely while the MCO is still enforced as it will be difficult for us to track them down if they leave identified locations.

"That is the main objective of (yesterday's) operations which we conducted at several locations in the capital," he told Bernama.