ACAMPO -- Take a drive on Highway 99 near Lodi and you can't miss it -- the Parachute Center in Acampo.
But instead of skydivers coming in and out of the hangar, Tuesday, it was federal agents with the U.S. Department of transportation. They carried out bags, boxes and tubs of what appears to be evidence.
A spokesperson with the U.S. Attorney's Office says a warrant was issued at the Parachute Center, but it's sealed, so they can't say what it's for.
Center owner Bill Dause claims he doesn't know either.
All he said to FOX40 on camera:
"This is private property, please leave."
Dause's skydiving business has been under a federal microscope after five deaths were reported there in just two years -- most recently in September when 54-year-old Brett Hawton died during a solo jump, according to the San Joaquin County Sheriff's Office.
As for this investigation, the Parachute Center was closed to the public Tuesday. As the sun set, agents wrapped up theirs hours long search, packed up the last of the evidence and left the area.
Stay with FOX40 and FOX40.com for updates on this developing story.