They seized 140,000 methamphetamine pills in one raid alone.
The Provincial Police Bureau 1 launched the crackdown, involving 23 teams of 506 police, after receiving a tip-off that 22 suspects were using Ayutthaya province as their base for the drug trade in Bangkok, the Central Plains and the Northeast in coordination with drug convicts in Klong Phai Prison in Nakhon Ratchasima's Sikhiu district.
Police seized 70 packages containing a total of 140,000 methamphetamine pills from a rented house in tambon Chiang Rak Noi of Bang Pa-in.
The bust followed the arrest of four suspects earlier in Bangkok where a drug-producing machine was confiscated and 28,000 speed pills were seized along with 940g of crystal methamphetamine, or ya ice.
In Wang Noi district, police arrested Somchai Thanongchid, Mirantee Thida and Thongchai Amnuaypanich at a house. They were wanted on arrest warrants issued on drug charges.
Pol Lt Gen Nares Nanthachote, chief of Provincial Police Region 1, said the raid had been planned three months in advance.
The operation was carried out in collaboration with local police and related investigation units. The targeted locations were thought to be part of a network of drug gangs active in many provinces, including Bangkok, Suphan Buri and Si Sa Ket.
The gangs have a lot of money and weapons at their disposal, Pol Lt Gen Nares said.
Meanwhile, narcotics suppression police arrested five men and one woman who were allegedly delivering drugs in a parking lot at Suvarnabhumi airport Sunday.
Police said a man and a woman drove two pickup trucks to the parking lot. The trucks contained almost 500,000 methamphetamine pills between them.
The drugs were placed in hidden compartments.
Pol Lt Gen Chaiwat Chotima, chief of the Narcotics Suppression Bureau, said four men drove a car to the parking lot and were about to pick up the drugs when police arrested them.