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Believed used for the exact opposite purpose of why it was created. it was created to keep the bad people out in this situation it looks like it kept the good person that needed to be in the cockpit, the pilot, the captain out. should that be addressed in terms of changing the locking mechanisms on these doors? >> here we have this safety chasing the tail here. because what happens is you add a safety feature to prevent x. now you've created y. so now we add a safety feature. we're going to add cameras now to stop y. but then y is going to create another problem. what we're not doing is defini...

Press conference and they approved a plan to remove a breached container. in that container is a flammable odorless gas called vinyl chloride. they are looking at whether crews this problems and the bridge collapsed on friday. workers with con rail that owns the bridge were out days before the derailment doing an inspection. as they look for prior inspection records officials are pointing to a faulty traffic signal for causing that disaster >> our team is going to be working to identify the point of derailment. they are going to be working to coordinate the bridge signal and track inspection r...

And track inspection records, and, in particular, they are going to be looking at the movable bridge and the locking mechanisms on the movable bridge. >>heather: appear evacuation has been ordered for the surrounding areas as crews conduct air and water quality tests. >>gregg: judgment judge's in the top court walking off the job protesting against an increasingly violent and chaotic political crisis. the latest twist pitting morsi against the legal system. you are look at live pictures in tahrir square, in cairo, and it is packed with demonstrators in the midnight hour, and, also, steve harri...

Looks really, really good. and very real as well. so we'll have him right here at the desk in a few minutes. first more turbulence for american airlines as the carrier cancels dozens of flights over a safety issue. >> american now says it knows what causes locking mechanisms to fail and seats to become unhinged. now the problem has to be fixed. here's abc's jim av la. >> american has grounded half its fleet of 757s, its domestic long-range workhorse, taken out of service for a second round of faa monitored fixes to prevent passenger seats from becoming dislodged in the air. in one case they ...