Ten million made-in-Myanmar methamphetamine pills and nearly half a tonne of crystal methamphetamine hidden in tea packages have been seized from a convoy of cars in Bangkok, police said on Friday.
The drugs -- worth around 1 billion baht on the local market -- were being ferried along the "narcotics corridor", which cuts through the central province of Ayutthaya to Bangkok and then south to Malaysia.
Police followed the four cars from Ayutthaya, which is a key warehousing site for the drugs which pour from Myanmar's meth labs.
They made the bust once the convoy had reached downtown Bangkok late on Thursday, police said, finding crystal meth concealed in Chinese-branded tea packages and the pill bundles.
"Six suspects who were paid to transport drugs were arrested," national police chief Gen Chakthip Chaijinda told a new conference. Some of the drugs were "destined for foreign countries".
"They belong to the northern Wa group," he said.
The ethnic group is based in Myanmar's Shan State which jointly oversees the world's second-largest drug producing region, the notorious "Golden Triangle" border zone that encompasses parts of Myanmar, Laos, Thailand and China.