Police have arrested a man and three secondary school students over the force's biggest methamphetamine bust this year.

Acting senior superintendent Kwan Chun-hin from the narcotics bureau said officers seized 242 kilogrammes of the drug, worth over HK$82 million.

At a media briefing on Saturday, Kwan said the methamphetamine was flown into Hong Kong from Mexico and labelled as frozen food. The haul was later delivered to an industrial building in Kwai Chung where the four arrests were made.

“This case exposes the shamelessness and despicable nature of drug trafficking syndicates. They exploited teenagers’ naivety and eagerness to make quick money, and recruited three minors to take on high-risk roles such as unloading and delivering drugs,” Kwan said.

“The adult in this case merely stood outside the building as a lookout, believing that standing away could reduce the risk of being arrested.”