i heard three booms. like boom, boom, boom. reporter: federal crash investigators are only beginning to find answers, a mystery compounded by an absence of critical communication. something really unusual here, that missing communication was from the pilots. they confirmed today a short time ago, saying that the pilots made no contact with the tower in birmingham to tell them, erin, that they were in trouble. interesting given what the eyewitness are saying. it sounded to them that there was trouble. when you hear about a cargo crash i m thinking recently there have seemed to be quite a few of these. a spate of these, right? reporter: that s right. very high profile, in fact. we had very disturbing video that you have probably seen in the past. this was back in april at bagram air base in afghanistan. a 747 cargo plane crashes when a
Contact with the tower. interesting given what the eyewitness are saying. it sounded to them that there was trouble. when you hear about a cargo crash i m thinking recently there have seemed to be quite a few of these. right? reporter: very high profile. we had very disturbing video that you have probably seen in the past. suddenly shifts on take off. there are two other crashes 2010 and 2011 in other parts of the world. those were aattributed it s believed to a problem. it can start a fire. when investigators start looking at every little piece they pay
Contact with the tower. interesting given what the eyewitness are saying. it sounded to them that there was trouble. when you hear about a cargo crash i m thinking recently there have seemed to be quite a few of these. right? reporter: very high profile. we had very disturbing video that you have probably seen in the past. suddenly shifts on take off. there are two other crashes 2010 and 2011 in other parts of the world. those were aattributed it s believed to a problem. it can start a fire. when investigators start looking at every little piece they pay very close attention to what that plane is carrying.
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