The five-week operation involved police in Singapore, Hong Kong, Japan, South Korea, Malaysia and Thailand. SINGAPORE: Police officers from six Asian jurisdictions have arrested 435 people - including 21 men in Singapore - for their suspected involvement in online child sexual exploitation activities. Police forces from Singapore, Hong Kong, Japan, South Korea, Malaysia and Thailand conducted a cross-border operation from Feb 24 to Mar 28, the Singapore Police Force (SPF) said on Friday (Apr 4).