PHOENIX -- Federal prosecutors are seeking to bar the release of the autopsy results for six people killed in a Tucson rampage targeting U.S. Rep. Gabrielle Giffords.

Court records show the request to U.S. District Judge Larry Burns for the gag order was filed Monday by prosecutors who say the families of five of the victims objected to the release of the reports.

The prosecutors also are seeking to prevent Pima County's deputy chief medical examiner, Dr. Eric Peters, and his staff from talking to the media about the case.

Jared Loughner is accused of shooting Giffords and 18 others.

Killed in the January shootings were 9-year-old Christina-Taylor Greene, federal Judge John M. Roll and Giffords aide Gabriel Zimmerman. The other three were bystanders Dorothy Jean Morris, Phyllis Schneck and Dorwan Stoddard.