DELPHI, Ind. — Indiana State Police say the base of operations for the unsolved slayings of two northern Indiana girls is moving to a smaller workspace.

Sgt. Kim Riley says the base for the investigation into the killings of 14-year-old Liberty German and 13-year-old Abigail Williams will return to Delphi City Hall from the Carroll County REMC building as the anniversary of the girls’ Feb. 13 disappearance approaches. He didn’t disclose a specific date for the move.

Riley said the larger workspace no longer is needed.

The Delphi teens vanished Feb. 13 while hiking near their hometown of Delphi, about 60 miles northwest of Indianapolis. Their bodies were found the next day.

Police say a national television show’s segment on the unsolved slayings of two teenage girls has spurred an increase in tips on the case.

Riley says that before the “Dr. Phil” talk show aired a segment Wednesday on the killings of Liberty German and Abigail Williams, police were receiving between two and five tips a day about the case.

But Riley tells the Journal & Courier that about 140 tips were received within 20 hours of the segment’s airing.