BELGRADE, Serbia (AP) — Serbia’s authorities are investigating reports that a cargo package bound for the U.S. containing two missiles with explosive warheads was found on a passenger flight from Lebanon to Serbia.

“The AGM-114 II Hellfire is an air-to-ground missile developed primarily for the anti-armour role.” — ArmyTechnology.com

N1 television said the package with two guided armor-piercing missiles was discovered Saturday by a sniffer dog after an Air Serbia flight from Beirut landed at Belgrade airport.

Serbian media say documents listed the final destination for the AGM-114 Hellfire missiles as Portland, Oregon. The American-made projectiles can be fired from air, sea or ground platforms.

N1 reported Sunday that Air Serbia is helping in the investigation. The Serbian flag carrier says “security and safety are the main priorities for Air Serbia.”

In a statement to KOIN 6 News, Jennifer Adams with the Portland office of the FBI said, “The FBI is aware of the report and is looking into it. No further information is available at this time.”

Scott Winegar, the director of Homeland Security Education at Concordia University, told KOIN 6 News these have been heavily used by drones to fire on targets over the past few years.

He said the investigation as to where these came from needs to start with the Defense Department.

“The other organizations that we have in the US are not responsible for distributing Hellfire missiles. That’s a Department of Defense asset so, wherever it came from, it would have to have come through the Department of Defense’s logistical chain,” Winegar said. “If it came from the US, if it came from our allies, that’s going to muddy the waters.”KOIN 6 News reporter Jennifer Dowling contributed to this report.