IOWA CITY, Iowa (AP) – Authorities have seized a computer and flash drives from the Iowa home of a woman whose daughter was convicted of a high-profile murder, based on a search warrant alleging the two worked together to harass prosecution witnesses by spreading defamatory information about them online.

Records obtained by The Associated Press show the items were seized Tuesday at the Urbandale condominium of 68-year-old Anna Richter. Her daughter, Tracey Richter, was convicted of the murder of a neighbor in what prosecutors said was a plot to frame her ex-husband. The incident happened at Richter’s home in the Sac County town of Early.

The warrant application says the Richters and their associates are targeting witnesses who testified against Tracey Richter. No one has been charged.