Philadelphia police confirmed to Fox News that US Airways Flight 777 traveling from Shannon, Ireland was forced to make an emergency landing at Philadelphia International Airport Wednesday afternoon after receiving an unspecified threat.

All passengers - and their baggage -- were  removed from the plane following the landing and will be re-screened. Reports indicate the plane is expected to be isolated, as well.

Further details about the nature of the threat aren't yet known. Stay tuned for more updates.