ANNAPOLIS, Md. (AP) _ 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 at an Anne Arundel County home where a woman named Amy Welch lives. She is the granddaughter of Richard Welch, who has been named as a person of interest in the investigation into the murder of 12-year-old Sheila Lyon and her sister, 10-year-old Katherine, in 1975. The items were seized Tuesday. Francke says police can’t provide additional details on the warrant at this time. Earlier this month, police charged Lloyd Welch Jr., an imprisoned sex offender, with two counts of murder in the case. He is Richard Welch’s nephew.