Two dead after mid-air plane collision Wednesday at southern Arizona airport

( ABC )

Two people are dead after two planes collided mid-air Wednesday morning at an airport in southern Arizona.

The crash occurred at Marana Regional Airport, outside Tucson.

Marana Police Department officials say both planes were occupied. Scripps News Group Tucson has confirmed that at least two people died in the crash. The victims have not been identified.

Officials with the Federal Aviation Administration tell ABC15 a Lancair, with two people on board, collided mid-air with a Cessna 172, with two others on board, at around 8:30 Wednesday morning.

Viewer-submitted photos show smoke in the direction of the airport.

Marana Regional Airport is an uncontrolled field, according to the FAA.

WHAT IS AN UNCONTROLLED FIELD?

An uncontrolled field is described by the FAA as an airport that does not have an operating ATC control tower.

Pilots use a common traffic advisory frequency (CTAF) to announce their position to other pilots who are in the airport vicinity. The pilot-in-command is responsible for maintaining safe operation from other aircraft. Pilots in these fields are required to comply with all FAA regulations, including minimum visibilities, minimum safe altitudes, and right-of-way rules.

The Federal Aviation Administration (FAA) and National Transportation Safety Board (NTSB) are investigating.

Earlier this month, a pilot was killed and four others were injured in an aircraft crash on a runway at the Scottsdale Airport.