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explosives. more now from evan perez. >> reporter: according to the fbi, he checked the bag and in routine screening happening by the tsa, they found explosives in this checked bag. according to the fbi, this is what they found. they found powder that was in a plastic wrap, they found fuses. powder appears to be from commercial grade fireworks. and so the question is, you know, what was he doing with this. the airport tried to page him while he was still at the airport. he left. and he was later arrested that evening on monday by the fbi. the court documents that were released today ...

The derailment and they all expect exposure to these chemicals. pete buttigieg met wednesday with the administrator to ensure improvements. and after a deadly head-on collision between two trains in gr greece, teams are losing hope of finding anymore survivors raising questions about the country's less than stellar track record with railway safety. nada bashir is live for us. have investigators made a final determination about what caused this crash? >> reporter: the investigation is still very much ongoing, but at this stage authorities have said that they have arrested one man, the manager...