GRAND JUNCTION, Colo. -- Aviation officials said the main passenger door fell off a twin-jet business plane as it was taking off from Grand Junction Regional Airport, but no one was hurt.

Federal Aviation Administration spokesman Mike Fergus said the front left side door tumbled from the Bombardier Challenger CL-60 shortly before 4 p.m. on Monday, forcing the plane to make an emergency landing.

Fergus said the plane was "climbing" when the door fell out. It landed in a desert area west of the airport property, he said.

No one on the plane or on the ground was hurt. There were two pilots on board the aircraft but no passengers.

As emergency crews waite, the jet circled back to the airport and landed safely. It was flying from Grand Junction to Rifle.

Fergus said investigators will look into why the door detached from the jet. FAA investigators are expected at the airport Tuesday.

The plane's registered owner is WFP Investments of Snowmass Village. No one answered the company's phone after business hours Monday.

Airport officials said the plane was towed to Westar Aviation for inspection.