been fully maintained. something that's happened at 38,000 feet -- as far as kploefb decompression -- explosive decompression, you can't rule out the possibility of a terrorist bomb. it's a possible. although they're treating it as an accident at the moment. the aircraft obviously hit in one piece and broke up because as somebody else said just before it is not scattered over a wide area which it would have been had it broken up at high altitude. it hit the ground at high speed and totally disintegrated. why didn't the pilots put up -- i suspect they were incapacitated. >> right. of course, we don't know. we have to emphasize that to viewers across the globe. at this point, we do not know what happened. your sense is that this was some sort of catastrophic event. but you're not sure what that may have been. there has been talk about the problem of rapid descents for the airbus.