(Fox News) Authorities are investigating a suspicious package found on a UPS plane that arrived at Philadelphia International Airport Friday.

A crew member arriving on a UPS flight from Paris notified authorities of a suspicious package on board describing a potential radiological component, a local CBS affiliate reported.

Philadelphia police and firefighters greeted the inbound flight shortly after 9 a.m. and the two occupants exited the aircraft, the station reported.

A second UPS flight, which was due to take off from Philadelphia, was also isolated in the investigation, local station WPVI reported.

Department of Homeland Security is investigating the incident with help from local police and the FBI, a source at the airport said.

UPS said in a statement that its “cooperating with authorities to investigate a suspicious package that arrived in Philadelphia.”

Operations at the airport are not affected and all flights are taking off and landing as scheduled, the airport reported.

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