DELPHI, IN — Authorities investigating the unsolved murders of two teenage girls killed during a 2017 hiking trip in northern Indiana said Friday they will hold a news conference Monday to provide an update on their investigation.

Indiana State Police said officials “will announce an update in the Delphi Investigation” at a Monday news conference. ISP investigators did not give any indication what they would announce regarding the February 2017 killings of Liberty German, 14, and Abigail Williams, 13.

The news conference will reportedly include officials from State Police, the Carroll County Sheriff’s Office, the Carroll County Prosecutor’s Office and the U.S. Marshals Service.