The accident took place at 11:05 a.m. and caused no injuries because those on the plane were able to eject before the crash, the National Defense Secretariat, or Sedena, said in a communique.

"The crew of pilot and copilot were not hurt but are undergoing general medical exams to make sure they have no injuries," Sedena said.

The two planes were Beechcraft T-6C Texan II military trainers that were engaged in aerial acrobatics as one of the closing acts of the Mexico's Aerospace Fair 2015, which was being held in its first year at the Santa Lucia military air base and was inaugurated last April 22 by Mexican President Enrique Peña Nieto.

The president noted the importance of the event for positioning "Mexico as one of the most attractive poles of the aerospace industry in the world."

Though why the accident happened remains unknown, witnesses at the event say it could have been brought about by a slight scrape of the two planes, local media reported.

"When coming out of a double-mirror maneuver, one of the planes went out of control," according to Sedena, which called for the Aerial Accidents Investigation and Judgment Commission for an in-depth study of what caused the crash.

The plane went down very near the military base, it said.

The air show had an audience of close to 200,000 people, of whom none were injured, local media said.

When the plane hit the ground it broke into flames and sent up a column of smoke; the fire was soon extinguished by the firefighters corps.

These military training aircraft are made in the U.S. and Sedena uses them to teach pilots to make short flyovers providing air support for military action on the ground. - FOX News.