By Siriya Chankantha
Many of the undocumented workers were suffering heat stroke after being held captive in a locked shed under a scorching sun.
Police are now seeking to identify those involved in the smuggling and detention of the workers, who were released at a longan orchard in Chiang Mai's San Sai district on Tuesday afternoon.
Chiang Mai immigration police chief Pol Colonel Komen Suparp and his deputy Lt-Colonel Thitiwat Reuchanukul led the raid at 2.30pm on suspicions that the orchard in Ban Thung Khao Tok (Moo 5) of Tambon Nong Yaeng was being used to harbour illegal workers.
As officers broke open the lock to free the 11 men and 15 women from the shed, the orchard owner fled.
Thitiwat said that a gang of people smugglers had picked up the foreign workers from the border area in Chiang Rai's Mae Sai district before locking them in the shack for two days pending their transport to Bangkok.