Just days after a journalist and at least eight other Palestinians were gunned down by Israeli forces during anti-occupation demonstrations in Gaza, a recent video of an Israeli sniper shooting an unarmed Palestinian man emerged for the first time on social media Monday, providing further evidence that the deliberate killing of civilians “is routine for Israel.”

“This video may be from months ago, Israel is claiming, which does not in any way make it less horrifying,” Ali Abunimah, co-founder of Electric Intifada, wrote on Twitter Monday.

Apparently filmed by an Israeli soldier, the undated video shows what appears to be an unarmed man standing near the fence that separates Israel and Gaza.

After the sniper shoots the man, one of the soldiers yells “yes!” and “son of a bitch!” in celebration as a crowd rushes toward the body.

Watch (warning: the video is disturbing):

In response to the video, which sparked outrage as it began to spread on Twitter Monday, U.S. Campaign for Palestinian Rights executive director Yousef Munayyer noted that “while this shows one individual soldier’s act, it is made possible by criminal orders from the top that authorized use of lethal force against unarmed protesters that has resulted in hundreds being shot.”

As Common Dreams reported, the prominent Jerusalem-based human rights group B’Tselem argued ahead of last week’s protests that Israeli soldiers are “duty-bound to refuse to comply” with “patently illegal” orders to shoot unarmed civilians.

In a statement on Monday, Ayman Odeh—leader of the Joint List, an alliance of four predominantly Arab parties in Israel’s parliament—called the latest video of Israeli soldiers massacring a civilian “horrifying” and said “the soldier who shot should be prosecuted, but whoever gave the order to shoot unarmed demonstrators is the truly dangerous one.”

The Israeli Defense Forces announced after the video emerged that the incident is being “reviewed” and “investigated.”