Bangkok, July 15 (DPA) Myanmar authorities intercepted nearly one tonne of heroin in Shan state in one of the biggest drug busts in recent history, Thai media reports said Wednesday.

The massive seizure, netting 950 kg of heroin and 340,000 methamphetamine pills, was made Monday in Tachilek, in northeastern Myanmar, the Bangkok Post reported, citing anti-narcotics officers who spoke on condition of anonymity.

Thai sources said the heroin was refined in Mong Hsat, a town south of Tachilek that is known to be under the control of business associates of the late Khun Sa, former 'kingpin' of the heroin trade in the Golden Triangle -- where Myanmar, Laos and Thailand meet.

Khun Sa died in 2007 in Yangon, where he lived under house arrest after surrendering to Myanmar authorities more than a decade ago.

Once the source of more than 1,000 tonnes of heroin a year, the Golden Triangle's output has declined over the last decade due to the departure of Khun Sa, adverse weather, crop substitution programmes and anti-drug measures.