The main suspect behind the torture and killing of a South Korean college student allegedly involved in online scams in Cambodia in August has been arrested by local police officers, a diplomatic source said Friday. Cambodian authorities apprehended the suspect, a Chinese national, in Phnom Penh on Thursday on murder and other charges, according to the source. The suspect is accused of torturing and murdering the 22-year-old student, surnamed Park, near Bokor Mountain, where employment scams