AMARILLO, Texas — Authorities said a pilot and his passenger were killed when their twin-engine plane crashed into a concrete storage building in the Texas Panhandle city of Amarillo.

Texas Department of Public Safety Trooper Gabriel Medrano said the two Amarillo men in their 50s died this morning when their plane went down in the southeast part of the city.

Medrano said the cause of the crash is being investigated. The victims' names were not immediately released.

Medrano said it was not immediately known if the plane was flying in or out of an Amarillo airport at the time of the crash.

Most of the wreckage was on the ground near the building. But part of the plane was on top of the 30-foot-tall structure.