Syrian rebels in Idlib province downed a regime war plane on Saturday following what appears to be heavy anti-aircraft fire.
Ahrar al-Sham released a video showing the downing of the Mig-21 - as it nose-dived to the ground - using a 23mm "machine gun" around the northern Idlib countryside.
Pro-Ankara Daily Sabah reported that the plane crashed on the Turkish side of the border and that the pilot ejected safely.
Ahrar al-Sham is part of a Turkish-backed military campaign in Aleppo province fighting Islamic State group militants and Kurdish groups.
It follows a huge bombing campaign against the rebel-held province on Saturday with one medical worker in Idlib reporting a high number of casualties.
"Bombs raining down on us in #Idlib #Syria. Many injured," Dr. Shajul Islam tweeted.
He confirmed that a jet had been downed in a later tweet, while photos from the ground showed smoke billowing from the site.
Others believe a mechanical fault could have caused the plane to malfunction and crash.
Bombing in Syria has decreased since December due to a ceasefire between rebels and the regime.
However, rebel-held Idlib has been continuously bombed by regime, Russian and US war planes during these months.
Syrian rebels shoot down regime war plane
Syrian rebels shoot down regime war plane
MENA
1 min read
Ahrar al-Sham says its fighters have shot down a Syrian regime war plane in northern Idlib with a 23mm gun, as the rebel-held province suffers severe bombings.