KUALA LUMPUR: Malaysia's top border control official has cautioned against travel offers that come with requests or conditions to carry items without knowing their contents.

Malaysian Border Control and Protection Agency (MCBA) director-general Datuk Seri Mohd Shuhaily Mohd Zain said those who encounter such situations should immediately alert the authorities.

"You must be suspicious of anything given to you by strangers because you could end up being detained overseas for smuggling prohibited substances, including drugs," he said when contacted.

His comments follow reports that five Malaysians were arrested in Tokyo, Japan, for attempting to smuggle 5kg of cocaine.