Police from Hunan province have arrested 22 drug trafficking suspects, uncovered 268 kg of methamphetamine tablets and seized 5.28 million yuan ($642,000), Legal Daily reported on Monday.

It is the biggest drug trafficking case nationwide so far this year.

Police from the province said that in July last year they investigated a drug trafficking case and later set up a special investigation team.

On March 8, they sent about 300 officers to Foshan in Guangdong province, Wuhan in Hubei province and Shaoyang city in Hunan.

On March 10, with the help of border control police in Yunnan province, they stopped a truck transporting drugs at a checkpoint in Jinghong city, Xishuangbanna prefecture, Hunan police said.

Officers seized 268.1 kg of methamphetamine tablets from 20 banana boxes on the truck.