Police arrested a man yesterday on suspicion of bludgeoning a businesswoman to death with a wooden rod and later throwing her body into the sea. Last night, about 20 officers from the force's diving team were still searching for the body of the 36-year-old woman, surnamed Wong, in the sea off Kwun Tong public pier. The search started at 3pm but her body had not been retrieved by last night. The 39-year-old suspect, surnamed Ng who is a partner in a logistics company in Wong Chuk Hang, was being detained at Tai Po police station for questioning, and no charges had been laid. A preliminary investigation revealed that the man owed the woman about HK$300,000 in connection with an investment, according to police. The businesswoman was the owner of another logistics company and knew the suspect through business. She was unmarried and lived alone in Tuen Mun. Officers believe that the victim was killed when she went to the suspect's Wong Chuk Hang office and quarrelled with him over the money late on Friday. Superintendent Steve Li Wing-hong of the New Territories North regional crime unit said investigations revealed that the victim was beaten to death with a wooden rod during a heated argument. 'The body was stuffed into a black plastic bag, driven to Kwun Tong public pier and then pushed into the sea,' he said. Police said the body was pushed into the sea in the early hours of Saturday. The killer apparently threw away the wooden rod and his bloodstained clothes somewhere in Aberdeen. Officers believe the suspect acted alone in the case. Police began to investigate the case after the woman's family members and boyfriend were unable to contact her and reported their concerns to police on Sunday. Detectives from the New Territories North regional crime unit took over the case on Tuesday. At about 9am yesterday, officers arrested a man in Wong Chuk Hang when he was on his way to work. Some blood was discovered in his office and taken to a government laboratory for examination, according to a police source. A delivery van, allegedly used to transport the body to Kwun Tong, was also confiscated in Wong Chuk Hang.