BUCHAREST, Romania—Five passengers on a small plane that made a forced landing Monday on a remote mountain in Transylvania were found alive after a massive search, but the pilot and a student later died, authorities said.

The plane was transporting medics from Bucharest to western Romania to harvest organs for transplant when it was forced to land at an altitude of 1,400 meters (4,595 feet) due to heavy fog and low visibility said aviation chief Aleodor Francu.

Emergency authorities said that Adrian Iovan, an experienced pilot with 16,000 hours of flying time, who had been trapped in the plane, had died. A medical student who was seriously injured later died, Victor Zota, head of the national transplant program said.

Hundreds of rescue workers and local residents combed the remote area in deep snow and dense fog for 4 1/2 hours until the damaged aircraft was located.