India, Feb. 14 -- The ongoing mystery surrounding the disappearance of Nancy Guthrie, mother of Today show host Savannah Guthrie, has seen an unprecedented turn as a pool cleaning service was seen working at her residence.

This comes while Nancy's house still remains an active site for investigation.

Video circulating on social media shows trucks from a local pool company parked at the gated Catalina Foothills home on February 13. A video of Ambiance Pool Service & Supplies trucks parked in the driveway was posted by reporters who had set up shop at her house.

Later, a drone shot showed workers were seen skimming the pool and dragging nets through it while a law enforcement deputy stood nearby.

However, News13's Mary Coleman later rev...