A South Korean navy plane has crashed during a training flight, killing all four crew members on board. There were no reports of civilian casualties on the ground.

The plane crashed just six minutes into its flight. No civilians were reported dead or injured. A South Korean navy plane crashed in the southeastern city of Pohang on Thursday, killing all four crew members on board, according to local media. The navy said the cause of the crash was under investigation.

The turboprop aircraft, which was used for marine patrols, crashed at around 1:50 p.m. local time in Pohang, a city about 250 miles southeast of Seoul, according to officials. Two officers and two noncommissioned officers were on board, a military official said at a briefing. The bodies of all four were later recovered, fire fighters said.