(CNN) -- A Polish navy aircraft on a training flight crashed Tuesday on Poland's northeastern coast, and the four service members aboard are feared dead, navy spokesman Lt. Gregory Lyko told CNN.
The crew of the Bryza twin-turboprop transport plane was practicing landing with only one engine, Lyko said.
The crash occurred around 5 p.m. (11 a.m. ET) near the Babie Doly navy airfield near Gdynia, Poland, about 185 miles north of Warsaw.
The rescue operation is currently ongoing and the Polish navy has launched an investigation into the cause of the crash, Lyko explained.