Two people are dead after a small plane registered to a Tucson company crashed and burst into flames at the Casa Grande Municipal Airport, authorities say.

The twin-engine Beechcraft Air King went down about 11:35 a.m. Wednesday as it was landing, Federal Aviation Administration officials said.

The plane exploded and burned after crashing just north of a runway, and both people aboard were killed, authorities said.

The names of the victims are being withheld until relatives have been notified, Casa Grande police and fire officials said.

The name of the company it's registered to also was not released.

The cause of the crash is unclear, FAA spokesman Ian Gregor said.

A witness saw the plane try to land on the runway when it kicked up and flipped over, The Arizona Republic said.

The FAA and the National Transportation Safety Board will investigate the crash.