A federal reconnaissance team of structural engineers gathered documents and interviewed officials this week to determine why the Dallas Cowboys practice facility collapsed.
Spokeswoman Gail Porter said everyone who was interviewed has been cooperative.
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She said the engineers finished their work Wednesday.
Cowboys spokesman Rich Dalrymple declined to comment on the federal inquiry.
The Dallas Morning News reports Porter wouldn't comment on whether the engineers also spoke with representatives of Summit Structures, the company that designed and built the tent-like facility.
Summit spokeswoman Laurey Peat said the company had never spoken with them and has received no call.
The collapse of the Cowboys facility in heavy winds May 2 left 12 people injured, including a 33-year-old team staff member who is paralyzed from the waist down.