The Myanmar authorities have seized 140kg of heroin packed into blocks and hidden in a car in the notorious “Golden Triangle” area near the Thai border, police said on Thursday.

Two men were arrested in the border town of Tachileik in eastern Shan State during the bust, which netted drugs with a street value of US$2.3 million (S$2.86 million), the police told AFP.

“We seized 404 blocks of heroin weighing 140kg,” police colonel Myint Aung of the anti-narcotic department said. “It’s the largest seizure of heroin so far this year.”

Opium, heroin and methamphetamine pills are frequently smuggled from Myanmar into Thailand, the gateway to the South-east Asian narcotics market.