Detectives were last night questioning a 38-year-old man arrested in connection with the killing of a woman, whose almost-decapitated body was found on a remote beach on Friday. The man, a South Asian, who investigators believe knew the victim, was picked up in the early hours of yesterday in a flat in Nam Cheong Street, Sham Shui Po. He was later taken to a building in Tung Chau Street, also in Sham Shui Po. Police are also interviewing a woman in connection with the killing. An initial post-mortem examination was carried out yesterday as officers from the New Territories South crime unit studied footage from surveillance cameras from Sea Crest Villa, a housing estate near where the woman's body - understood to be that of a South Asian - was found. The body was discovered by an elderly woman on the shore near Castle Peak Road in Tsing Lung Tau on Friday morning. The victim is believed to have been killed late on Thursday night. She had suffered deep cuts to her throat that extended to the back of the neck and she was wearing only her underwear. There were no defensive wounds on the body and no signs of a struggle at the crime scene. Detectives also said there was no evidence of a sexual assault. A fruit knife seven to eight inches long believed to have been used in the killing was found near the shore, and a 500-metre trail of blood extended from near a temple to a footpath on Castle Peak Road. A pool of blood, a handbag, a wallet and two dresses were found at a hillside about 100 metres away from where the body was washed up. No identification document was found. The victim could have been killed on the hillside and then pushed into the sea, the police said on Friday. Police have received seven reports of homicides in the first six months of this year. The number in the same period of last year was 17.