Police have seized 3.8 million methamphetamine tablets in Thailand's largest drug bust in years.
The haul was estimated as worth more than one billion baht ($US31.7 million).
Police Maj. Gen. Comronwit Toopgrajank said the pills and 71kg of crystal meth were found hidden in an empty house in Bangkok's northern outskirts.
Police raided the house yesterday after tracking down a driver who abandoned his vehicle after a car chase.
Thailand is a leading market and transit point for methamphetamine, much of which is produced in neighbouring Myanmar.
