"It displayed hostile intent and advanced on coalition forces", the coalition said.
The US-led coalition said the location was close to where another "pro-[Assad] regime" drone, which intelligence sources had also identified as Iranian, was shot down on June 8.
Australia's military is suspending the airstrikes that it had been carrying out against the Islamic State as part of a USA -led coalition in Syria, one day after Russian Federation criticized the US downing of a Syrian warplane and threatened to target coalition aircraft in a wide swath of Syria.
Moscow has now suspended a hotline meant to prevent confrontations in Syria's crowded air space, and warned it could consider US-led coalition planes "targets".
Australia said it would temporarily halt air operations over Syria after the plane was downed.
The area falls in a part of Syria that was recently identified as military priority by Damascus, and strategically important for Iran as it seeks to secure a land corridor between forces it backs in Syria and Iraq.
On Sunday evening, a Syrian regime SU-22 fighter dropped bombs near USA -backed Syrian Democratic Forces fighters south of Tabqah in Syria and, in accordance with rules of engagement, was immediately shot down by a U.S. F/A-18E Super Hornet.
On Monday, the Iranian Revolutionary Guard Corps demonstrated some of its military prowess by launching ballistic missile strikes from western Iran against ISIS targets in the Syrian city of Deir ez-Zour, according to The Guardian.
Washington also described those strikes as self-defence.
Coalition forces are using the Al-Tanaf base by Syria´s borders with Jordan and Iraq to train anti-jihadist Syrian fighters and stage attacks against IS.
Its forces are moving on three fronts, south of Raqa city, through the central Badia desert region, and along the eastern border. Israeli security officials said Monday they were studying the missile strike to see what they could learn about its accuracy and capabilities.
"There's no authorization for military force that Congress has passed that gives the president the ability to take military action against the Syrian regime", Murphy said.
It came as United States and Russian officials held talks on creating a "de-escalation zone" in southwestern Syria that would include Deraa.
The last time Russian Federation threatened to cut off the deconfliction line was in April, when the USA launched missiles at a Syrian airbase in what ultimately amounted to a warning shot in retaliation for Assad's continued use of chemical weapons.