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@steveklabnik replied to a tweet by @steveklabnik:
with quote tweet:
@Allegheny_Co ("Allegheny County") wrote:
Allegheny County 9-1-1 has received reports of a loud boom, shaking in the South Hills and other reports. We have confirmed that there was no seismic activity and no thunder/lightning. At this point, we have no explanation for the reports, but agencies are continuing to look.