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BIRMINGHAM, Alabama (WVTM) -- National Transportation Safety Board investigators are on the ground in Birmingham, Alabama sifting through the wreckage of Wednesday's UPS cargo plane crash.

They're collecting evidence and trying to determine what exactly caused the plane to crash.

The NTSB says a plane crash of this magnitude usually takes about 12 to 18 months to investigate and determine a cause.

Once the team is finished collecting evidence the agency will turn the plane back over to UPS.