WATCH: ISIS Releases Video Purportedly Showing Syrian Fighter Jet Downed by Israel

Footage shows the Syrian jet in flames after it crashed into the ground, and people can be heard in the background shouting 'Allahu Akbar'

ISIS released video footage on Wednesday purportedly showing the Syrian fighter jet shot down by the Israeli military. The footage shows the Syrian jet in flames moments after it crashed into the ground, and people can be heard in the background shouting "Allahu Akbar." 

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It said that the Russian-made Sukhoi plane was under surveillance when it flew some 2 kilometers (1.25 miles) into Israeli airspace. Syria said in response that one of its jets was targeted by Israel while conducting raids in southern Syria, in Syrian airspace.

Israel's air defenses fired two Patriot missiles at the jet. IDF Spokesman Brig. Gen. Ronen Manelis said the plane was either a Sukhoi-22 or -24 and that it crashed in Syrian territory in the southern portion of the Syrian Golan Heights, although the fate of the pilots was unknown.

The Israeli military said the Syrian plane took off from the T-4 airbase near Homs, which was the target of at least two Israeli airstrikes in the past. The base was used by Iranian forces and housed a command center for Iran's drone operations in Syria. 

Prime Minister Benjamin Netanyahu echoed the military's statement, calling it "a gross violation" of the existing agreement between the two countries.

"Our air defense systems identified a Syrian Air Force jet that took off from the T-4 Syrian Air Force base and penetrated Israeli airspace," Netanyahu said. "This is a gross violation of the 1974 Separation of Forces Agreement with Syria. I have reiterated and made clear that we will not accept any such violation. We will not accept any such penetration of, or spillover into, our territory, neither on the ground nor in the air. Our forces acted appropriately. We insist that the Syrians strictly abide by the Separation of Forces Agreement between us and them.