"It's fairly common to see Israeli agents infiltrate the crowds of Palestinian stone throwers during demonstrations", writes Jerusalem-based video reporter Andrea Bernardi. "I've witnessed this plenty of times in Jerusalem. The goal of these 'moustaarinine' -- literally 'those who disguise themselves as Arabs' -- is to stop the protesters. They usually take out their weapons without using them, or, more often, point them into the sky, as if they were about to shoot into the air."

"But today I for the first time filmed these undercover agents firing live bullets into a crowd of protesters".