NBC station WDIV-TV of Detroit reported that an unidentified man who is dying from cancer told Roseville police that he saw men moving a black bag at the garage of the house just hours after Hoffa went missing. Acting on the tip, authorities ran radar tests last week that picked up an image of something buried beneath a cement slab in the backyard.

Roseville Police Chief James Berlin confirmed that investigators had received the tip, telling the Detroit Free Press that “the information seemed credible, so we decided to follow up on it.”