A man suspected to be mentally ill was arrested last night over the death of his younger brother, whose body was found in a rubbish storage area on a Sham Shui Po public estate. Police received a call at about 7.10pm from a neighbour who said a 36-year-old man had collapsed near a refuse room on the third floor in block two of Pak Tin Estate. Officers went to the scene and found the man, who was wrapped in a blanket, was dead. Police believe the body had been moved yesterday from the flat he had shared with his brother. They knocked on the door of a nearby flat and the man's elder brother, 39, surnamed Fung, answered the door. Initial investigation suggested Fung was allegedly connected to the death, police said. The suspect was handcuffed, masked and taken to a police station last night. Police said the state of decomposition of the body indicated the man had been dead for three or four days. Neighbours said the brothers had both been mentally ill for years and lived with their grandfather, who was in his 80s and was now in hospital in the Caritas Medial Centre. They said the brothers, whose parents were dead, often had arguments in the flat and appeared to get into physical fights. It is the second violence case involving mentally ill people in a week. On January 19, a woman, 46, with a history of mentally illness was arrested on suspicion of killing her 67-year-old mother in a row over money at a flat in Hei Wah House on Lok Wah South Estate, Sau Mau Ping, where signs of struggle were found. Broken items such as bowls, glasses and glass containers were scattered across the floor in the living room and balcony. Last year there was a string of violent cases involving the mentally ill.