An unemployed man has been arrested for using a spring gun to shoot people at random from his Tin Shui Wai home, injuring two. His actions were thought to be only a prank, but a woman needed surgery and a boy required stitches for their injuries. Officers seized two long-barrel guns, two short-barrel guns and 730 airgun pellets from the 26-year-old former barber's flat in Heng Kin House, Tin Heng Estate. Police are examining if the guns were illegally modified. Chief Inspector So Chun-kwong of Yuen Long police said that while a long gun could shoot as far as 500 metres, the distance between the man's flat and the victims was only 60 metres. "It is believed that the suspect's intention was only for a prank," So said. "He was not aiming at any particular person." Of the four guns seized, three were air-operated while one of the long guns used a spring. Initial investigations indicate that the spring gun - the strongest - injured the two victims. So said a lead pellet that last Thursday pierced about 5cm through the skin of a 19-year-old woman was removed in hospital. A nine-year-old boy shot on Monday last week had stitches to minor injuries on his forehead. A police source said officers had determined from the victims' locations that the suspect must have shot from the 11th floor or above of the Tin Heng Estate building. They then found bullet holes on a wall in the rear staircase of the 14th floor, indicating that someone had been practising shooting there. Police targeted two apartments, and in raiding the first one yesterday morning, found the suspect, who was detained overnight after he admitted to the shootings. So warned that any one who shoots with the intent to do grievous bodily harm was liable to life imprisonment.