P212 CEEFAX 212 Sat 25 Aug 23:31/24       Clashes between rival gangs in Northern Ireland early today left a policeman and a civilian injured. The gangs, each about 100 strong, clashed in Castledjrg, County Tzronj. Police fired two plastic bullets and there were three arrests. In Belfast, police made one arrest when youths began putting up barricades in the Niwtownards area. News index 102/202 Newsreel 119/219