United States officials believe Iran was behind a drone attack last week at a military outpost at al-Tanf in southern Syria where American troops are based. Officials said Monday the US believes that Iran provided resources and encouraged the attack, but that the drones were not launched from Iran, The Associated Press news service reported. The drones were Iranian, and Iran appears to have facilitated their use, officials said, speaking on condition of anonymity to discuss details that have not been made public. Officials said they believe the attacks involved as many as five drones laden with explosive charges, and that they hit both the US side of al-Tanf garrison and the side where Syrian opposition forces reside. There were no reported injuries or deaths as a result of the attack but it comes in a period of rising tensions between the US and Iran.

MOSCOW/UNITED NATIONS – Russia released drone footage Monday showing new destruction in Syria's historic town of Palmyra, which was recently recaptured by the Islamic State group, and warned that the militants could be planning the further demolition of antiquities. The Russian Defense Ministry says Syrian government forces are advancing toward the town as another battle for the ancient site looms. The video showed that the militants have badly damaged the facade of the Roman-era amphitheater and the Tetrapylon -- a set of four monuments with four columns each at the center of the colonnaded road leading to the theater. The video appears to show that only two of the 16 columns remain standing. IS militants have destroyed ancient sites across their self-styled Islamic caliphate in Syria and Iraq, perceiving them as monuments to idolatry.

Russia released drone footage Monday showing new destruction in Syria's historic town of Palmyra, which was recently recaptured by the Islamic State group, and warned that the militants could be planning the further demolition of antiquities. The Russian Defense Ministry says Syrian government forces are advancing toward the town as another battle for the ancient site looms. The video showed that the militants have badly damaged the facade of the Roman-era amphitheater and the Tetrapylon -- a set of four monuments with four columns each at the center of the colonnaded road leading to the theater. The video appears to show that only two of the 16 columns remain standing. IS militants have destroyed ancient sites across their self-styled Islamic caliphate in Syria and Iraq, perceiving them as monuments to idolatry.

This photo combo, made from footage taken from the Russian Defense Ministry official website, purports to show the Roman-era amphitheater on June 6, 2016, left, and on Feb. 5, 2017, right. Russia's defense ministry has released drone footage showing new destruction in Syria's historic town of Palmyra, which was recently recaptured by the Islamic State group, and warned that the militants could be planning the further demolition of antiquities. The video shows that the militants have badly damaged the facade of the amphitheater. This photo combo, made from footage taken from the Russian Defense Ministry official website, purports to show the Roman-era amphitheater on June 6, 2016, left, and on Feb. 5, 2017, right. Russia's defense ministry has released drone footage showing new destruction in Syria's historic town of Palmyra, which was recently recaptured by the Islamic State group, and warned that the militants could be planning the further demolition of antiquities.

Russian combat engineers arrived in Syria on a mine-clearing mission in the ancient town of Palmyra after it was recaptured from Islamic State of Iraq and the Levant (ISIL) this week. On Thursday, the Defence Ministry said sapper units were airlifted to Syria with equipment including state-of-the art robotic devices to defuse mines at the 2,000-year-old archaeological site. Russian television stations showed Il-76 transport planes with the engineers landing before dawn at the Russian air base in Syria. Sunday's recapture of Palmyra by Syrian troops under the cover of Russian air strikes was an important victory over ISIL fighters, who controlled the area for 10 months. Lieutenant General Sergei Rudskoi of the military's General Staff said Russian advisers helped plan and direct the Syrian army's operation to recapture Palmyra.

Russian combat engineers arrived Thursday in Syria on a mission to clear mines in the ancient town of Palmyra, the military said. The Defense Ministry said the sapper units were airlifted to Syria with an array of equipment, including state-of-the art robotic devices, to defuse mines at the 2,000-year-old archaeological site. Russian television stations showed Il-76 transport planes carrying the engineers landing before dawn at the Russian air base in Syria. Sunday's recapture of Palmyra by Syrian troops under the cover of Russian airstrikes was an important victory over Islamic State extremists who operated a 10-month reign of terror there. Lt. Gen. Sergei Rudskoi of the military's General Staff said that Russian military advisers had helped plan and direct the Syrian army's operation to recapture Palmyra.

The ancient ruins of Palmyra, one of Syria's oldest cities, have stood for 3,000 years, but, since last May, the Unesco World Heritage site has been facing some of the most brutal threats to its existence. Located in an oasis northeast of the Syrian capital of Damascus, Palmyra has become a significant symbolic and military position in the now 5-year-old Syrian conflict. After seizing the city of roughly 50,000 residents last May, the Islamic State group was forced out of Palmyra over the weekend by forces loyal to Syrian President Bashar Assad. On a strategic level, retaking Palmyra gives the Syrian regime a strong military base for future operations against the militants' other strongholds as well as renewed control over some of Syria's most important oil and gas fields. But regaining Palmyra is also a highly symbolic win for the Syrian regime -- now trying to salvage whatever is left of the ancient ruins -- in its quest to position itself as a key partner in the fight against the terrorist group, also known as ISIS. An aerial view of the historic city of Palmyra, in Homs Goveronorate, Syria, is seen in this still image taken from a drone video, March 28, 2016.