NEW : Rural crash area had clouds and reduced visibility . NEW : `` These are difficult times , '' president says at public funeral . Investigators do n't find evidence of an explosion or a fire aboard the aircraft . `` In visual and preliminary investigations of the crash site , the remains of the aircraft do not show evidence of any kind of damage from an explosion or fire , '' said Dionisio Perez-Jacome , minister of communication and transportation . Mexican Interior Minister Jose Francisco Ruiz Massieu said that there were no signs of sabotage on board the plane.
NEW : Rural crash area had clouds and reduced visibility . NEW : `` These are difficult times , '' president says at public funeral . Investigators do n't find evidence of an explosion or a fire aboard the aircraft . Mexican Interior Minister Jose Francisco Ruiz Massieu said that there were no signs of sabotage on board the plane.