BBC Monitoring have some information about Syria's Turkmen, after a Turkmen rebel group claimed to have shot dead two Russian pilots who ejected from their downed Su-24 jet this morning.
The Turkmen are ethnic Turks who under Bashar al-Assad's government were banned from publishing or writing in Turkish.
The Syrian Turkmen Brigades are about 10,000 strong and are one of the main Turkish-trained Turkmen opposition groups operating in the area where the Russian plane crashed, according to BBC Monitoring.
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Turkey's Hurriyet News has posted a video that alleges to show the killing of the two Russian pilots from the downed Su-24 jet.
Turkmen rebels claim that they shot dead both of the pilots as they parachuted out of the downed plane.
Gunfire can be heard throughout the video. A man shouts in Turkish, asking gunmen not to shoot, because the pilots are potential hostages.
"Don't shoot! A hostage is coming, a hostage," the man shouts according to Hurriyet.
The authenticity of the video has not been independently confirmed.
More on the claims by Turkmen rebels that they shot dead both Russian pilots from the downed Su-24 jet.
Turkmen Deputy Commander to the 2nd Coast Division Alpaslan Çelik told Turkey's Dogan news agency that both pilots were killed.
"We shot the pilots while they were landing with parachutes. Their bodies are here," Çelik said.
Russian Foreign Minister Sergey Lavrov has just announced he has canceled his visit to Turkey tomorrow, November 25, in the wake of this morning's downing of a Russian Su-24 jet.
Federica Mogherini, the EU's High Representative for Foreign Affairs and Security Policy has tweeted that she talked with NATO Secretary General Jens Stoltenberg this morning in the wake of the downing of the Russian Su-24 jet by Turkey.
A Turkmen official in Syria has said that his forces shot dead both Russian pilots as they parachuted to the ground after ejecting from their downed Su-24 jet.
Earlier today, a Syrian rebel group claimed that its gunmen had shot dead one of the pilots. The fate of the other pilot was unknown.
This claim is not yet verified.
Viktor Zavarzin, a member of the Russian parliament’s defense committee, has warned that Russia will not leave the downing of the Su-24 jet unanswered, TASS reports.
"Our miitary aircraft did not violate Turkish air space," Zavarzin said.
"Today's incident is a serious provocation for regional and global security, the consequences of which will be irreversible...From the Russian side there will be an appropriate reaction, a response. The actions of the Turkish authorities are completely unacceptable, they have made a huge mistake."
Zavarzin added that "everyone is threatened by IS. And we can only fight it together...But now we see that many are clearly hindering our fight against terror. That's why what happened, happened."
Here's the video obtained by Reuters from a Syrian rebel group calling itself the 10th Brigade purports to show one of the pilots from the Russian plane shot down near the Syrian-Turkish border.