The U.S. -led coalition shot down the Syrian warplane over the city of Rasafeh in the southern countryside of Raqqa, while the warplane was carrying out a combat mission against the Islamic State (IS) group, said the general-command of the Syrian army.
"In accordance with rules of engagement and in collective self-defense of Coalition partnered forces, [the Syrian SU-22] was immediately shot down by a U.S. F/A-18E Super Hornet", the news release said.
The Pentagon said the shoot-down came hours after Syrian government-backed forces attacked USA -backed fighters, known as the Syrian Democratic Forces, in the village of Ja'Din.
The statement described the Syrian military advance as a combat mission against ISIS militants, according to Reuters, and it said the confrontation with coalition forces was a "flagrant" attack created to undermine the army.
The Syrian Democratic Forces managed to capture the Bitani District, Sunday, after a short battle with the Islamic State (ISIL).
Before it downed the plane, the coalition had "contacted the its Russian counterparts by telephone via an established "de-confliction line" to de-escalate the situation and stop the firing".
"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".
"Coalition aircraft conducted a show of force and stopped the initial pro-regime advance toward the SDF-controlled town", the release said.
The incident marks the first time a US jet has shot down a manned hostile aircraft in more than a decade, and is a marked escalation in the six-year-old Syrian conflict.
The Syrian Army said their operation was part of an ongoing push into ISIS-held territory, and that they view the U.S. attack as a "flagrant" attempt to undermine their anti-ISIS operations.
The shootdown is the latest escalation between the US -led coalition and pro-regime Assad forces in Syria.
"The coalition's mission is to defeat ISIS in Iraq and Syria", the Pentagon's statement said.
- Editor's note: This story will be updated.