Thai police have arrested a Japanese man who allegedly ran a scam that defrauded more than 200,000 Japanese retirees in Thailand with fake health insurance schemes, officers said Tuesday.

Yu Hamaji, 34, was arrested on Sunday under a warrant as he attempted to leave Thailand, immigration police said.

Police raided two houses last month in Pattaya, a popular beach resort city southeast of Bangkok, and arrested five Japanese nationals.

They included the leader of the ring, who allegedly operated a call center in Thailand targeting elderly Japanese residents.

Authorities believe Hamaji was one of the masterminds behind the operation, which swindled victims out of an estimated 300 million baht (¥1.36 billion).

Chaya Panakit, immigration police chief of investigation, said more than 200,000 people have been swindled by the scam.

"The maximum loss of one victim was around ¥100 million ($630,000)," he said.

The scam involved fraudsters impersonating Japanese government staff to sell bogus health insurance packages, according to the police statement.

Authorities are still searching for two suspects — who remain at large — with the help of the Japanese Embassy in Bangkok.