Footage of Jewish extremist youth at a Jerusalem wedding dancing with guns and knives, stabbing a photo of Ali Dawabsheh, the baby who was killed during an arson attack on a Palestinian family's home in Duma, has emerged causing public outrage.Aired on Israel's Channel 10 television late on Wednesday, the clip showed a wedding at which one dancing celebrant stabbed a picture of 18-month-old Ali Dawabsheh while others waved assault rifles, knives and what appeared to be a Molotov cocktail.In the video one can see dozens of teens and young men singing a song in praise of revenge, while holding up guns and knives, Haaretz reported and added that Zionist Union leader Isaac Herzog wrote on Twitter: "You miserable people, youtarget="_blank"'>The arson, and delays in solving the case, although Israel has several suspects in custody, contributed to the outbreak of the worst Palestinian street violence in years.