New Delhi, Feb. 19 -- The investigation into the kidnapping of Nancy Guthrie, the 84-year-old mother of US television anchor Savannah Guthrie, has widened beyond the United States, with the FBI reaching out to Mexican law enforcement amid growing concern over her whereabouts.

The FBI has contacted federal authorities in Mexico to alert police agencies and coordinate information-sharing, as investigators explore the possibility that Guthrie may have been taken across the US-Mexico border. Officials, however, emphasise that there is currently no concrete evidence confirming such a move, TMZ reported.

Authorities believe it is unlikely that Guthrie was transported across the border immediately after her abduction. Border Patrol surveillanc...