Two Fort Campbell pilots were killed in a helicopter crash during a training mission Wednesday night in Clarksville.

A press release from Fort Campbell stated that a 101st Airborne Division (Air Assault) Apache helicopter crashed near Fort Campbell, Kentucky, around 7 p.m.

Two pilots were on board and both died in the crash.

The crew members, who have not been identified, were flying during a routine training mission when the aircraft went down.

The investigation continued Thursday morning into what caused the crash, but officials said that could take weeks, possibly months, to determine.

It took rescue crews some time to reach the scene because it is in a rural location on Gholson Road in Clarksville.

"They were making big circles with their spotlights. I knew they were looking for something, just didn't know what," said Tyler Wallace, a local farmer. "I feel really sorry for the families. Those guys do a lot for this country and I'm grateful for all they do. I'm really sorry that happened."

Matt Gabell, another neighbor in the area, told NewsChannel 5 he could feel the vibration of the crash in his home while recording a podcast. He said it shook the house so much, it knocked a cell phone off a table.

He tweeted about the crash knocking out the podcast signal.