The incident was reported just after 1:30 p.m., prompting an immediate closure of the busy roadway in Tredyffrin Township. All lanes remain blocked as of 1:48 p.m., and drivers are advised to avoid the area, Pennsylvania Department of Transportation officials said.
Emergency crews are on-site managing the situation, but no details about injuries or the number of vehicles involved have been disclosed.
The closure is expected to last until at least 3:30 p.m., according to the latest update.
This is a developing story. Check back here for updates.
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