The raid took the Japanese authorities in Singapore completely by surprise . Never suspecting such an attack could be mounted from Australia , they assumed it had been carried out by local saboteurs , most likely pro-Communist Chinese guerillas . In their efforts to uncover the perpetrators , a wave of arrests , torture and executions began . Local Chinese and Malays , as well as interned POWs and European civilians were targeted in this programme . The incident became known as the Double Tenth , for 10 October , the day that Japanese secret police began the mass arrests
Double Tenth
Double Tenth incident
Operation Jaywick