The search for Cherrie Mahan , the 8-year-old girl who went missing from a bus stop in Butler County in 1985, brought law enforcement to Armstrong County on Tuesday.

Cherrie Mahan was last seen on Feb. 22, 1985, on Cornplanter Road in Winfield Township, Butler County. (Photo: National Center for Missing and Exploited Children/Pennsylvania Crime Stoppers)

Sources told KDKA that digging in South Buffalo Township on Tuesday morning was connected to the Mahan case. She was last seen in Winfield Township, about 45 minutes from Pittsburgh, and there's been no sign of her for 40 years .

Cherrie Mahan case update

On Tuesday, Pennsylvania State Police investigators were along the Allegheny River about 10 miles from where the girl was last seen. At sunrise, with assistance from the FBI, st

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