Bukit Aman’s criminal investigation department director M Kumar said efforts were being made to trace the suspects.

“All seven have been placed on the wanted list,” he said in a statement.

The seven are among 34 people for whom Singapore police have issued arrest warrants. The others on the list are Singaporeans.

The Malaysians were identified as Tang Soon Fai, Kang Liang Yee, Tang Soon Wah, Hoe Ming Wei, Pang Han Ee, Bernard Goh and Yip Chee Hoe.

The 34 are said to be linked to 15 other suspects, including two Malaysians, who were charged in September over their alleged roles in the same syndicate.

The Singapore police said a joint enforcement operation with Cambodian police was carried out on Sept 9 against an organised criminal group impersonating government officials in a scam targeting Singaporeans.

The group was believed to be operating from a scam compound in Phnom Penh and was allegedly responsible for 438 cases involving losses of at least S$41 million.

Following the initial operation, 15 suspects, comprising 12 Singaporeans, two Malaysians and one Filipino, were arrested in Singapore. On Sept 11-12, they were charged with being members of a locally linked organised criminal group.