US shoots down Syrian Air Force fighter

A US warplane shot down a Syrian army jet on Sunday in the southern Raqqa countryside with Washington saying the jet had dropped bombs near USA backed forces and Damascus saying the plane was downed while flying a mission against Islamic State militants.

A Syrian warplane was shot down over Raqqa by the United States-led coalition after a Syrian regime SU-22 dropped bombs near Syrian Democratic Force, or SDF, fighters.

The attack comes after pro-Syrian forces attacked SDF fighters in Ja'Din - a town south of Tabqah, and a known deconfliction area - wounding a number of SDF fighters, officials said.

The Syrian Democratic Forces managed to capture the Bitani District, Sunday, after a short battle with the Islamic State (ISIL).

Following the strike, the coalition alerted Russian counterparts to de-escalate the situation.

"The attack stresses coordination between the US and ISIS, and it reveals the evil intentions of the US in administrating terrorism and investing it to pass the US-Zionist project in the region".

Roughly two hours later, despite the called-for stand down and the US presence overhead, a Syrian Su-22 jet attacked the Syrian Democratic Forces, dropping an unknown number of munitions on the USA -backed force.

The move appears to mark a new escalation of the conflict.

"The Coalition's mission is to defeat ISIS in Iraq and Syria".

Since the US-backed rebels failed to slow the Syrian Army down in southern Syria, the USA is now relying on the Kurdish forces to obstruct Damascus expansion eastward.

Just hours earlier, the U.S. bombed Syrian government and allied troops inside a protected zone in that area, and marked a sharp escalation in the skirmishes between the coalition and pro-Syrian government forces there.

Tanf is a key town on the Iraq-Syrian border that has been home to a U.S. Special Operations training outpost for months.

Coalition aircraft then stopped the pro-government forces' initial advance with a "show of force", the coalition said, adding that it does "not seek to fight the Syrian regime, Russian or pro-regime forces" but would not "hesitate to defend itself or its "partnered forces from any threat".

- Editor's note: This story will be updated.