A father and son have been arraigned on charges for kidnapping two federal biologists at gunpoint in a remote area of a California forest. File Photo by John Angelillo/UPI | License Photo

July 21 (UPI) -- A father and son have been arraigned on charges for kidnapping two federal biologists at gunpoint in California.

Joseph Charles Henrichsen, 49, and his son Phoenix Henrichsen, 23, were in federal court in Sacramento, Calif., on Monday when they were charged with kidnapping a federal employee and aiding and abetting.

The charges stem from the Henrichsens allegedly confronting two female U.S. Forest Service staff biologists last week at Gumboot Lake Campground in the Shasta-Trinity National Forest in California. Joseph was armed with a rifle when he approached the biologists in a remote area of the forest. He zip-tied their hands behind their backs and ordered them to a trailer nearby where they were held.

When they arrived at the trailer, Phoenix joined them, court documents say.