ian, the investigation now turns to that mysterious flash detheed by u.s. satellite. what more do we know? >> we know that u.s. military and intelligence officials are investigating this flash. trying to determine if it happened in midair or on the ground. now, there's a few theories of what this could be. it could indicate there was a missile. it could indicate a bomb. it could also indicate that an explosion happened from a malfunctioning engine or possibly this is the flash from the plane once it's hit the ground. these are all things that they're going to be looking into trying to determine what exactly it was. and of course when the plane hit the ground as we've seen from the wreckage, there was a fire. you can see charred parts in some of the pictures of that wreckage. so they're going to try to determine what exactl that is. we haven't heard anything from the egyptian officials yet