French charity Action Against Hunger delivered the first emergency food rations to the last holdout of militiamen loyal to Ivory Coast's ousted strongman Laurent Gbagbo, as gunfire erupted around a church filled with refugees.
Emergency operations coordinator William Dufourcq says Tuesday's shooting prevented them from getting water to 4,000 residents holed up for days in northern Yopougon suburb.
Residents say dozens have been killed and homes and shops pillaged since die-hard militants rampaged after Gbagbo's April 11 arrest.
Forces loyal to President Alassane Ouattara have been fighting them for three days.
The rest of Abidjan is slowly returning to normal after a four-month standoff caused by Gbagbo's refusal to accept his electoral loss ended in a battle for the commercial capital.