FOUR men were last night charged with conspiring to kidnap a 10-year-old schoolboy whose body was found on a hillside in Tai Mo Shan Country Park yesterday. Two of them were accused of murdering Eddie Wong, whose body was found in a black plastic bag on a slope overlooking Kam Tin. Police made the discovery after a sweep of the parklands near Tsuen Wan. The four men were detained and will appear in Eastern Court this morning. Police in China and Macau have been asked by Hong Kong detectives to be on the lookout for a fifth man, aged 20, believed to be the ringleader of the gang. They believe he could be in Macau. Officers believe the boy was killed before his family had a chance to pay a $3 million ransom. Eddie lived with his parents, who are in their 40s, and two sisters in a luxury apartment in Cloud View Road, North Point. His father is a merchant who imports and exports foodstuffs from an office in Western. Last night, his grandfather, Wong On-chak, 75, said: 'He was a quiet and very polite boy. He was young but very smart. We all loved him very much. 'We'll miss him very much,' said Mr Wong, founder of the family businesses, On Chak Trading and On Chak Provisions. Senior Superintendent, Crime, of Hong Kong Island, Trevor Oakes, said a forensic pathologist could not ascertain the cause of death at the scene. He found burns near the boy's nose and mouth that may have been caused by corrosive fluid. 'The pathologist also found mosquito and ant bites on the body. I was told he had been dead for at least 11/2 days, or even longer. 'An autopsy will be held today.' The boy was still wearing school uniform of white shirt and grey shorts. He was abducted by four men at 12.30 pm on Monday just as he was going into the Buddhist Wong Cheung Um Primary School in Eastern Hospital Road. Police raided several flats in Kwun Tong, Ngau Tau Kok and Central on Wednesday morning and arrested three men, aged between 19 and 22. One man, aged 20, was arrested by Macau immigration officers as he was returning from Zhuhai late on Wednesday afternoon. Officers also located a car believed to have been used in the kidnapping in a North Point residential car park. A land and air search was mounted later that night after a suspect revealed that the boy had been pushed off a slope in Tai Mo Shan. The search was widened in daylight, with help from the suspect, to involve 250 uniformed and plain-clothes officers and eight dogs. Police Tactical Unit officers formed a line about 1,000 metres wide and moved down the slope. The body was found at 11.45 am. Eddie's uncle and aunt, a middle-age couple, visited the scene at noon left, distraught, in a chauffeur-driven Jaguar.