Wednesday night’s fatal crash at Ronald Reagan Washington National Airport involving a commercial airplane and a Black Hawk military helicopter has drawn renewed attention to air traffic controllers and what role they may have played in the accident that is believed to have killed 67 people.

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Air traffic control audio recorded the moments before and after an American Airlines regional passenger jet crashedwith a U.S. Army Black Hawk helicopter in a midair collision over Washington on Wednesday night.

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One air traffic controller was reportedly working two tower positions at the time of Wednesday's fatal crash near D.C.

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A source tells NBC News that, according to a preliminary FAA report, a single air traffic controller was handling both planes and helicopters when the crash occurred. Normally at the D.C. tower at that time of day and for the volume of air traffic,

PAT-25, do you have the CRJ in sight?” the controller asks the helicopter pilot, according to audio posted by the Associated Press.

It will be some time before investigators can offer clear answers to the cause of the midair crash at Ronald Reagan Washington National Airport but air traffic controller audio and radar reviewed by NPR offer some insight into what happened before.