Police arrested 44 young men and women in a raid on a pub in the middle of Pattaya City early on Wednesday morning and seized some drugs and a handgun and ammunition.
Pol Col Kornwat Hanpradit, deputy provincial police chief, led the raid on Amazing Pool Villa pub in tambon Nong Prue, Bang Lamung district.
It followed a tip-off people were gathering thereafter curfew hours.
When police arrived at about 1.30 am, the party was in full swing. They took into custody 22 young men, three of them Chinese tourists, and 22 young women.
A search found one small plastic bag containing crystal methamphetamine, 15 small bags of ketamine, 200 valium pills, 15 Ecstacy pills and a 9mm pistol with 10 bullets.
The 44 revellers were taken to Pattaya police station where they were initially charged with violating the emergency decree.
Police said there could be additional charges laid relating to the drugs and the gun.