PORT-AU-PRINCE, Haiti (AP) - Two French missionaries and two Haitians were kidnapped near a volatile slum in Haiti's capital, a U.N. official said Thursday. The four were seized on Wednesday as they traveled on a road near Cite Soleil, a sprawling slum on the outskirts of Port-au-Prince used as a base by heavily armed gangs blamed for a wave of kidnappings and violence in the capital, said David Wimhurst, a U.N. spokesman.