Updated at 1:48 p.m. ET
ANKARA, Turkey A plane intercepted by Turkish fighter jets on its way from Moscow to Damascus was carrying equipment and ammunition destined for the Syrian Defense Ministry, Turkey's prime minister said Thursday.
Recep Tayyip Erdogan's comments follow a fierce denial by Syria that anything illegal had been aboard the Airbus A320 that was forced by Turkey to land in Ankara late Wednesday. Syria, whose relations with neighboring Turkey have plummeted over the Syrian war, branded it an act of piracy.
Earlier in the day, Turkish officials had rejected claims by Syria's ally, Russia, that Turkey had endangered the lives of Russian citizens on board the aircraft.
"These were equipment and ammunitions that were being sent from a Russian agency ... to the Syrian Defense Ministry," Erdogan told reporters in Ankara.
"Their examination is continuing and the necessary (action) will follow," he added.
Yeni Safak, a newspaper close to the Turkish government, reported Thursday there were 10 containers aboard the plane, whose contents included radio receivers, antennas and equipment "thought to be missile parts."
Turkish state-run television TRT also reported the plane was carrying military communications equipment. Neither TRT nor the newspaper cited sources for their claims.
A western diplomat in Ankara told The Associated Press that Turkish authorities had found "military equipment" on board the plane, but did not elaborate. The diplomat spoke on condition of anonymity because he was not authorized to speak about sensitive issues.
The plane was allowed to continue to Damascus after several hours, without the cargo.
"As you know, defense industry equipment or weapons, ammunitions and such equipment cannot be carried on passenger planes," Erdogan said. "It is against international rules for such things to pass through our air space."
Erdogan refused to say how or from whom Turkey had learned that the twice-weekly scheduled flight would be used to transport military gear to Syria.
"As you will appreciate, those who gave the tip, which establishments, these things cannot be disclosed," he said.
Turkey has called for Syrian President Bashar Assad to step down and Damascus accusing Turkey of supporting the rebels. The two neighbors have traded artillery fire over Syria's northern border throughout the past week.
Hours before the Turkish statement, Russian Ambassador Vladimir Ivanovsky had held talks with Turkish officials at the Foreign Ministry.
Russian Foreign Ministry spokesman Alexander Lukashevich had said earlier Thursday that Moscow was concerned that lives and safety of the 35 passengers, including 17 Russian citizens, had been endangered.
He said Turkey without explanation denied Russian consular officials and a doctor access to the passengers, who had not been allowed into the airport for eight hours or provided with food.
"The Russian side continues to insist on an explanation for the Turkish authorities' actions toward Russian citizens and on the adoption of measures to avoid such incidents in the future," Lukashevich said in a statement.
Turkey's Foreign Ministry issued a statement saying that the pilot of the Syrian Air plane from Moscow had been warned of Turkey's intention to ground it as he approached from the Black Sea on Wednesday evening. It said he was given the chance to turn back, but that he decided to continue his course.
Rejecting claims that passengers were ill-treated, the Turkish statement said they were allowed to leave the plane if they wanted and that there was a medical crew and ambulances on standby. It also said that the pilot did not provide a passenger list and therefore Turkish officials did not know there were Russians on board until after it landed.
Separately, the Foreign Ministry said it had submitted a formal protest note to Syria for the violation of civil aviation rules and declared Syrian air space unsafe for Turkish planes.
Syrian Transportation Minister Mohammad Ibrahim Said said Turkey's decision to force the plane to land amounted to piracy.
The general manager of the Syrian Civil Aviation Agency also blasted Turkey's forced landing of the plane, calling it "contrary to regulations and aviation norms."
Ghaidaa Abdul-Latif told reporters in Damascus that the plane's pilots were not asked to land but were instead surprised by Turkish F-16 fighter jets, which forced them to land.
A Syrian Airlines engineer who was aboard, Haithan Kasser, said armed Turkish officials boarded the plane and handcuffed the crew before inspecting packages that he said contained electrical equipment.
Abdul-Latif said the officials seized some packages after presenting official documents.
Turkey's Transportation Minister Binali Yildirim said on Thursday that the cargo "was not suitable for a civil plane."
The Moscow airport that cleared the Syrian plane for takeoff denied there was any forbidden cargo on board.
"No objects whose transportation would have been forbidden under aviation regulations were on board," said Vnukovo Airport spokeswoman Yelena Krylova, ITAR-Tass reported
Krylova said all documentation related to the cargo was in order. She would not say who had sent the cargo.