BELGRADE, March 14 (Reuters) - Serbian authorities found two dummy U.S.-made training missiles en route from Lebanon to the United States on a civil flight via Serbia, sources familiar with the matter said on Monday.
The "captive air training missiles" did not have a warhead, rocket or guidance system, said one source who spoke on condition of anonymity, saying they were headed to the United States after being used to train the Lebanese Armed Forces.
The two were inert air-to-ground Hellfire missiles, the same model as one that arrived in Cuba by mistake in 2014 and was retrieved last month by U.S. officials and representatives from its maker Lockheed Martin. Cuba said that one had arrived by mistake on a commercial flight from Paris.
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Serbia finds US-bound guided missiles on flight from Beirut
This Thursday, Feb. 25, 2016 photo provided by the U.S. Air Force shows an unarmed Minuteman 3 intercontinental ballistic missile launches during an operational test from Vandenberg Air Force Base, Calif. The unarmed missile roared out of its underground bunker on the California coastline and soared over the Pacific, inscribing the signature of American power amid growing worry about North Korea's pursuit of nuclear weapons capable of reaching U.S. soil.(Staff Sgt. Jim Araos/U.S. Air Force via AP)
FILE - In this Saturday, Feb. 20, 2016 file photo provided by U.S. Air Force, an unarmed Minuteman III intercontinental ballistic missile launches during an operational test at Vandenberg Air Force Base, Calif. Like a giant pen stroke in the sky, an unarmed Minuteman 3 nuclear missile roared out of its underground bunker on the California coastline Friday, Feb. 26, 2016, and soared over the Pacific, inscribing the signature of American power amid growing worry about North Koreaâs pursuit of nuclear weapons capable of reaching U.S. soil. When it comes to deterring an attack by North Korea or other potential adversaries, the missile is the message. (U.S. Air Force via AP, File)
A man watches a TV news program showing a file footage of the missile launch conducted by North Korea, at Seoul Railway Station in Seoul, South Korea, Thursday, March 3, 2016. North Korea fired several short-range projectiles into the sea off its east coast Thursday, Seoul officials said, just hours after the U.N. Security Council approved the toughest sanctions on Pyongyang in two decades for its recent nuclear test and long-range rocket launch. The screen reads " North Korea launched missiles." (AP Photo/Ahn Young-joon)
ISRAEL - APRIL 7: In this handout photo provided by the Israel Aerospace Industries (IAI), an Arrow anti-missile missile is launched from a testing ground on April 7, 2009 in central Israel. The Defense Ministry confirmed the successful test of the anti-missile system designed to protect the country from attack by Iran. (Photo by IAI via Getty Images)
FILE - In this Sept. 13, 2012 file photo from video provided by ABC15 in Phoenix, the contrail of a Juno ballistic missile fired from Fort Wingate near Gallup, N.M., reflects early morning sunlight high above New Mexico. Authorities across the Southwest are preparing to be inundated with calls and emails from people who might catch a glimpse of the contrail from an early morning missile test Thursday, Dec. 10, 2015. (ABC15 via AP, File)
FILE - In this Sept. 13, 2012 file image from video provided by ABC15 in Phoenix, the contrail of a Juno ballistic missile fired from Fort Wingate near Gallup, N.M., reflects early morning sunlight high above New Mexico. Authorities across the Southwest are preparing to be inundated with calls and emails from people who might catch a glimpse of the contrail from an early morning missile test Thursday, Dec. 10, 2015. (ABC15 via AP, File)
In this photo provided by Vandenberg Air Force Base, an unarmed Minuteman III intercontinental ballistic missile equipped with a test reentry vehicle is launched from Vandenberg Air Force Base, Calif., on Wednesday, Oct. 21, 2015. The Air Force says the missile carried a test re-entry vehicle that headed for a target area 4,200 miles away near the Marshall Islands in the Pacific Ocean. The Air Force routinely uses Vandenberg to test Minuteman missiles from bases around the country.(Airman 1st Class Ian Dudley/U.S. Air Force via AP)
PAKISTAN, UNDISCLOSED LOCATION - NOVEMBER 17: A photo released by Pakistan army, on November 17, 2014, shows Pakistan army test-fires Shaheen 1A or Hatf IV ballistic missile, a nuclear capable ballistic missile with a range of 900 kilometres, days after testing a similar missile capable of hitting targets as far as 1,500 kilometres, bringing many Indian cities under its range. (Photo by Pakistan Army/Pool/Anadolu Agency/Getty Images)
This picture released by the official website of the Iranian Defense Ministry on Sunday, Oct. 11, 2015, claims to show the launching of an Emad long-range ballistic surface-to-surface missile in an undisclosed location. Iran successfully test fired a new guided long-range ballistic surface-to-surface missile, state TV reported on Sunday. It was the first such a test since Iran and world powers reach a historical nuclear deal. Iran's Defense Minister Gen. Hossein Dehghan, told the channel that the liquid-fuel missile "will obviously boost the strategic deterrence capability of our armed forces." (Iranian Defense Ministry via AP)
In this photo provided by the U.S. Air Force, an unarmed Minuteman 3 missile launches on Wednesday, Aug. 19, 2015, at Vandenberg Air Force Base, Calif. The Air Force said the missile was launched from California in a test of the intercontinental ballistic missile system. (Joe Davila/U.S. Air Force via AP)
This undated photo provided by the Israel Ministry of Defense shows a test launch of "David's Sling" missile system. Israeli officials said a joint U.S.-Israeli missile defense system has successfully passed a new test this and is expected to be operational next year. (AP Photo/Israel Ministry of Defense)
This photo provided by the Department of Defense U.S. Army White Sands Missile Range shows a NASA Terrier-Black Brant research rocket launching off of a test site located at White Sands Missile Range, in N.M. on Wednesday, Feb. 25, 2015. The purpose of the launch was to study the ionization in space and is designed to reach an altitude of just over 100 miles. (AP Photo/ Department of Defense U.S. Army White Sands Missile Range, Drew Hamilton)
A missile is launched during an Iranian army exercise in central Iran, Thursday, March 14, 2013. Iranian media say the military has test-fired several short-range missiles, including the type Palestinian militant Hamas group used to attack Tel Aviv last November. Thursday's report by the semi-official Fars news agency says the missiles were tested during an army exercise in central Iran. It says the missiles fired were Nazeat-10 and Fajr-5. Iran regularly holds maneuver to test and promote its military power.(AP Photo/Hadi Yazdani)
USA- JANUARY: USS Florida launches a Tomahawk cruise missile during Giant Shadow in the waters off the coast of the Bahamas during January 2003 - Giant Shadow is a Naval Sea Systems Command (NAVSEA),Naval Submarine Forces experiment to test the capabilities of the Navy's future guided missile submarines.(Photo by Ron SACHS/GAMMA/Gamma-Rapho via Getty Images)
398198 01: A prototype interceptor is launched from the Kwajalein Missile Range December 3, 2001 in Hawaii. The United States military has been testing controversial missile defense shields by successfully shooting down a dummy warhead on an intercontinental ballistic missile over the Pacific Ocean. (Photo by Ballistic Missile Defense Organization/Getty Images)
KWAJELEIN, UNITED STATES: To go with'MARSHALL ISLANDS-US' Undated photo shows a missile being launched at Kwajelein atoll on the Marshall islands. FP reports 14 January 2003 that dispute about the rent the United states pays for this testing range is threatening to derail a one billion, 20-year aid package. Foreign Minister Gerald Zackios said that the Kwajalen is a 'make or break' issue for the Marshall Islands. AFP PHOTO/US ARMY (Photo credit should read AFP/AFP/Getty Images)
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In the latest incident, the two inert missiles were discovered in wooden crates by bomb-sniffing dogs at Belgrade airport on Saturday, a source at the Serbian prosecutor's office said. They arrived from Beirut on Air Serbia and were due to be put on another flight to go to Portland, Oregon.
"Experts are determining whether the missiles were equipped with live or training warheads ... They were packed in proper transportation crates and supplied with paperwork," the Serbian source said.
However, the first source familiar with the matter described the discovery of the two inert missiles as a "false positive" and said they were never equipped with a warhead.
The Lebanese army also said the Hellfire missiles were training models, without any explosives in them, and that it was returning to the manufacturer.
"They belonged to the Lebanese army, which decided to send them back to the American company that manufactured them upon agreement with it, in accordance with legal and administrative procedures and after training with them had been completed," the Lebanese army said in a statement carried by the National News Agency.
The AGM 114 Hellfire, made by Lockheed Martin, is an air-to-surface missile which can be used against tanks and other armored vehicles. In addition to a version with a high-explosive warhead, the Hellfire is also produced as a practice weapon.
Air Serbia said it was helping with the investigation and that security and safety were its main priorities.
On Sunday, Lockheed spokesman Joe Stout said the company had seen a media report about the missiles in Serbia but had no further information. Pentagon spokesman Captain Jeff Davis said the missiles did not belong to the U.S. Department of Defense. (Additional reporting by John Davison in Beirut and by Arshad Mohammed and Phil Stewart in Washington)