FOUR people were arrested on Thursday in Cape Town township Nyanga following a shootout between political rivals hours before a non-denominational church service designed to calm tension in the area, police said.Police spokesman Captain Mark Romburg said the shootout occurred in KTC, a shanty-town in the heart of Nyanga, where five political organisers have been gunned down since Sunday.Three members of the African National Congress (ANC) and one member of the rival United Democratic Movement (UDM) were arrested, according to residents.