JOHANNESBURG (AP) — An American pilot employed by a conservation group is missing after air traffic controllers lost contact with his small plane between Nigeria and Cameroon, the group said.

Pilot Bill Fitzpatrick reported to the control tower at Douala, Cameroon on Sunday night that he was approaching the city, but the aircraft did not land, said non-profit African Parks, which is based in Johannesburg and manages seven national parks in six countries.