15 Syrian Army simultaneously slaughtered by executioners of ISIS

The Islamic State in Iraq and Syria (ISIS) militants fighting in Iraq and Syria claimed in a video posted online on Sunday that they beheaded several Syrian hostages and an American.
The video came two days after a United Nations panel investigating war crimes in Syria said the extremist group has been receiving “external support” in the past four years.
In a highly choreographed sequence earlier in the video, jihadists marched at least 18 hostages, said to be pilots and officers from the Syrian Arab Army, past a wooden box of long black military knives, each taking one as they passed, then forced them to kneel in a line and simultaneously decapitated them.
In the video, which is the latest in a series of mass executions and other atrocities carried out by ISIS, the extremist group announced the beheading of Peter Kassig and issued warnings to the US President Barack Obama, Britain and others including Shia Muslims.
"To Obama, the dog of Rome, today we are slaughtering the soldiers of [Syrian president] Bashar and tomorrow we will be slaughtering your soldiers. And with Allah's permission, we will break this final and last crusade, and the Islamic State will begin to slaughter your people on your streets," a masked militant said.
The video did not show Kassig’s beheading but showed the masked man standing with a decapitated head covered in blood lying at his feet.
"This is Peter Edward Kassig, a US citizen,” the English-speaking executor said in a British accent.
Reuters could not immediately verify the authenticity of the footage, which appeared on a jihadist website and on Twitter feeds used by ISIS.
Kassig's parents have said through a spokesperson their son was taken captive on his way to the eastern Syrian city of Deir al-Zor on October 1st last year.