Two Cessna 206 light aircraft collided in the northern Mexico state of Chihuahua on Thursday, killing all the four people on board, a Chihuahua state official said on Friday.

The planes fell to the top of a mountain close to the Agua Puerca ranch in Balleza, when the wings of the planes bumped into each other, said Rene Medrano, spokesman for the state attorney general's office.

It took rescue workers several hours to reach the scene where they only found the aircraft wreckage.

Media reports quoted witnesses as saying the pilots seemed to be playing with the planes in the air when the tragedy occurred.

(Xinhua News Agency September 16, 2006)