DETROIT -

A U.S. cargo plane company has released the names of seven people killed when one of its planes crashed in Afghanistan, and investigators are trying to discover why it went down right after takeoff.

Orlando-based National Air Cargo says six of the seven victims killed in Monday's crash on the grounds of Bagram Air Base were from Michigan and one was from Kentucky. All were U.S. citizens.

They were identified as First Officer Jamie Brokaw, of Monroe; pilots Brad Hasler of Trenton and Jeremy Lipka of Brooklyn; First Officer Rinku Summan of Canton; loadmaster Michael Sheets of Ypsilanti; and maintenance crew Gary Stockdale of Romulus.

Also killed was Timothy Garrett of Louisville.

The Boeing 747-400 was destined for Dubai in the United Arab Emirates.

The Afghanistan Ministry of Transportation and Commercial Aviation is leading the investigation. America's National Transportation Safety Board is also investigating the crash alongside the ministry.

The Federal Aviation Administration and Boeing also are participating in the probe.

NATO is discounting Taliban claims of responsibility for the crash.