CAIRO: Egypt's security expert, Sameh Sief al-Yazel, said the explosions, heard by Cairo residents on Wednesday, had no relation with the Israeli violation of Egypt's airspace or the collapse of a bridge in Maadi. He said what happened yesterday was a result of a training maneuver of aircrafts that broke the sound barrier above Cairo. On the other hand, he denied Egyptian gas flow Israel was resumed since the gas pipeline isn't repaired yet, pointing out repairs and maintenance process will take a long time.