UPDATE: The National Weather Service now says the loud sound and shaking ground Saturday morning was likely due to an exploding meteor.

Meteorologist Shannon Hefferan says a flash was captured by satellite data over Washington County just before 11:30 a.m.

PITTSBURGH (WTRF) — Pittsburgh area residents and those in the South Hills were startled Saturday morning by a loud boom and shaking according to our affiliate KDKA.

KDKA reports, “The boom was heard around 11:30 a.m. Saturday.”

Allegheny County authorities are investigating and have ruled out seismic activity and thunder or lightning, but they have “no explanation for the reports.”

Stay with 7NEWS and WTRF.com for updates to this developing story.