INDEPENDENCE, Mo. (AP)--Authorities investigating six family members accused in a series of sexual assaults involving young relatives dating back to the 1980s have seized booklets and magazines depicting incest from a family home.

The search warrant issued last week after the arrest of Burrell E. Mohler Sr., 77, of Independence, said investigators seized several items from Mohler's home, including four computer towers, several pornographic magazines and books, several DVDs, and cameras.

Mohler, his four adult sons and his brother, Darrel W. Mohler, 72, of Silver Springs, Fla., have been charged with raping and molesting several young relatives over roughly a decade. Accusations include impregnating at least two young girls and forcing one to have an abortion when she was 11.

Col. Ben Kenney of the Jackson County, Mo., sheriff's department said Wednesday that several booklets found at the home were about incest.

"The thing that was unusual was the title and the references," he said. "They were very explicit. ... It was all on sex with family members."

He said the computers that were seized were sent to an FBI lab in Kansas City for review.