ANNAPOLIS, Md. - Authorities are continuing to collect evidence in the case of two sisters who disappeared more than 40 years ago from a shopping mall in Maryland.
Capt. Darren Francke of Montgomery County police said Wednesday that a search warrant was served Tuesday at an Anne Arundel County home where a woman named Amy Welch lives. CBS affiliate WUSA reports items were seized from the home.
Amy Welch is the granddaughter of Richard Welch, who has been named as a person of interest in the investigation into the 1975 murder of 12-year-old Sheila Lyon and her sister, 10-year-old Katherine.
Francke says police can't provide additional details on the warrant at this time.
Earlier this month, police charged 58-year-old Lloyd Welch Jr., an imprisoned sex offender, with two counts of murder in the case. He is Richard Welch's nephew.
Sheila and Katherine Lyon were abducted from a suburban Maryland mall in March 1975. Authorities believe they were slain in Bedford County, Virginia, within three weeks of their abduction. Their bodies have never been found.
Police and prosecutors said at a news conference earlier this month that they believe 70-year-old Richard Welch sexually abused at least one of the Lyon sisters. He has not been charged but authorities have said they are continuing to build a case against him.
According to WUSA, police have said Lloyd Welch Jr. told investigators that his uncle Richard Welch and other family members were involved in the disappearance and murder of the Lyon sisters, as well as a subsequent cover-up.