Thai police have arrested three Australians they say are members of the Hells Angels motorcycle gang, seizing guns, swords and a sports vehicle.
Police said two of the men tested positive for drugs and will face charges before being deported.
Though police were on the hunt for eight foreign men thought to belong to the gang, they found only four - three Australians and a Canadian.
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"Traces of cocaine were found on them", he said. Pattaya is 100km (60 miles) southeast of the Thai capital, Bangkok.
The gang made headlines in 2015 when one of its members was murdered by an Australian man, who was sentenced to death in February for the killing.
Pol. Maj. Gen. Surachet said, "Some members of the Hells Angels gang were disguised as tourists and threatened national security as they were involved in extortion, money laundering, illicit drugs, and human trafficking".
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Members of Hells Angels.
Surachet said a raid mounted by the police saw the seizure of guns, ammunition, knives, an Audi sports auto and a Ford GT 315 vehicle.
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Thai police arrested four memebers of the Hells Angels biker gang on suspicion of drug crimes and violence.