South Korean army helicopter crash kills three

Local workers lift a damaged US-made AH-64E Apache attack helicopter from a roof in Taoyuan, northern Taiwan, on April 25, 2014. Two Taiwanese pilots were injured when their Apache attack helicopter crash landed on a building in northern Taiwan during a routine training mission, the military said. AFP PHOTO / Sam Yeh

A South Korean army helicopter crashed during a test flight on Monday morning, killing three soldiers, the country's defense ministry said.

All four crew members aboard were severely injured and three of them later died in hospital, a ministry official said.

The crash of the Bell UH-1H Iroquois helicopter took place at around 10 a.m. (8 p.m. ET on Sunday) in the eastern city of Chuncheon, about 110 kilometers (68 miles) from Seoul. Officials were investigating the cause of the crash.