ISIS kills dozens execution-style in Syria

In what is believed to be the group's largest mass killing of 2017, a monitoring group says ISIS killed dozens execution-style on Wednesday.

The terror organization carried out 33 killings near Syria's strategic city of Deir Ezzor on Wednesday morning, according to the Syrian Observatory for Human Rights.

The monitoring group -- who operates out of London -- called the mass killing "the largest execution operation carried out by the Islamic State organization in 2017."

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Inside Fallujah after years of ISIS occupation
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Inside Fallujah after years of ISIS occupation
A view is seen of streets in Falluja after government forces recaptured the city from Islamic State militants, Iraq, June 27, 2016. REUTERS/Thaier Al-Sudani
A view of streets in Falluja, Iraq, June 26, 2016. REUTERS/Thaier Al-Sudani
Destroyed buildings from clashes are seen on the outskirt of Falluja, Iraq, June 20, 2016. REUTERS/Thaier Al-Sudani
Houses are pictured in Falluja, Iraq, June 26, 2016. REUTERS/Thaier Al-Sudani
Damaged mosque is seen in Falluja, Iraq, after government forces recaptured the city from Islamic State militants, June 30, 2016. REUTERS/Ahmed Saad
A view of a street in Falluja, Iraq, after government forces recaptured the city from Islamic State militants, June 30, 2016. REUTERS/Ahmed Saad
Members of Iraqi government forces celebrate on a street in Falluja after government forces recaptured the city from Islamic State militants, Iraq, June 27, 2016. REUTERS/Thaier Al-Sudani
A member of Iraqi counterterrorism forces walks with his weapon in Falluja, Iraq, June 26, 2016. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY
A member of the Iraqi counterterrorism forces stands by an Islamic State militants weapons factory in Falluja, Iraq, June 23, 2016. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY
A member of the Iraqi security forces looks at explosives abandoned by Islamic State militants at a school in Falluja, Iraq, June 25, 2016. REUTERS/Thaier Al-Sudani
Rocket-propelled grenades left behind by Islamic State militants are seen at a school, following clashes in Falluja, Iraq, June 25, 2016. REUTERS/Thaier Al-Sudani
A book belonging to Islamic State militants is seen in Falluja after government forces recaptured the city from Islamic State militants, Iraq, June 27, 2016. REUTERS/Thaier Al-Sudani
Burnt out prison cells belonging to Islamic State militants are seen in Falluja after government forces recaptured the city from Islamic State militants, Iraq, June 27, 2016. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY
A burnt out prison cell belonging to Islamic State militants is seen in Falluja after government forces recaptured the city from Islamic State militants, Iraq, June 27, 2016. REUTERS/Thaier Al-Sudani
Members of the Shi'ite Badr Organisation inspect a factory abandoned by Islamic State militants, in Falluja, Iraq, June 25, 2016. REUTERS/Thaier Al-Sudani
A member of the Iraqi security forces tears up a signboard of the Islamic State militants in Falluja, Iraq, after government forces recaptured the city from Islamic State militants, June 30, 2016. REUTERS/Ahmed Saad TPX IMAGES OF THE DAY
Iraqi counterterrorism forces pose for a picture in Falluja, Iraq, June 26, 2016. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY
A fighter from the Iraqi Shi'ite Badr Organization holds his rifle in an underground tunnel built by Islamic State fighters on the outskirts of Falluja, Iraq, May 28, 2016. REUTERS/Thaier Al-Sudani
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Reports describe victims who were "killed by sharp tools" as between the ages of 18 and 25. Whether those killed were rebels, Syrian government officials or militia allies remains unknown.

The terrorist organization also killed at least 22 people in Iraq on Wednesday, when they opened fire on civilians and police in the city of Tikrit. They wounded an additional 31 people before blowing themselves up.

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