Four people who initially survived the crash of a Nigerian airliner Saturday have died, bringing the death toll from the disaster up to 107.
Investigators searched the plane's wreckage on Sunday trying to determine what caused Nigeria's second major airline accident in seven weeks.
The Sosoliso Airlines DC-9 was carrying 110 passengers and crew when it went down in the city of Port Harcourt during a thunderstorm.
Experts will analyze the plane's fight-data recorders, which were found earlier today.
The plane was on a flight from the capital, Abuja. A Catholic cleric (John Onaiyekan) says 71 of those killed were students from a Jesuit school going home for the Christmas holiday.
President Olusegun Obasanjo had vowed to improve safety procedures for all Nigerian aircraft after another airline crash in October killed 117 people.