The DNA was discovered on Fang's thigh and underwear and a thorough examination of samples, submitted to a lab in Madrid, revealed that the DNA belonged to two men.
The officers from Ang Mo Kio Police Division established the identities of the men with the help of follow-up investigations and the images from police cameras.
The man's possible drug offenses and customs violations have been reported by police to Singapore Customs and the Central Narcotics Bureau, respectively.