Israeli Head administrator Benjamin Netanyahu called the firebombing in the town of Duma close to the northern city of Nablus "a demonstration of terrorism in every admiration" and requested security strengths to chase down the culprits.
The assault further fed strains in the middle of Israelis and Palestinians, two days after Netanyahu disputably affirmed 300 new pilgrim homes in the West Bank.
The Palestine Freedom Association said it held Netanyahu's administration "completely dependable" for the passing of 18-month-old Ali Saad Dawabsha, contending it was "an immediate result of many years of exemption given by the Israeli government to pilgrim terrorism."
Palestinian president Mahmud Abbas required an examination by the Universal Criminal Court in The Hague.
As per Palestinian security authorities, four aggressors accepted to be Jewish pilgrims set a house ablaze at the passage to the town and scribbled graffiti on a divider before escaping to a close-by Jewish settlement.
The Israeli military and armed force radio said two homes had been set on fire by two covered men, and a tyke slaughtered and four relatives injured. It included that the graffiti had been composed in Hebrew.
Palestinian sources said those injured incorporated the baby's guardians - mother Reham, 26, and father Saad - and in addition four-year-old sibling Ahmed. Israeli medicinal sources said they had been taken to healing center.
The mother was in discriminating condition with severe singeing covering 90 percent of her body, an Israeli specialist told open radio, focusing on that her life was debilitated. The father had blazes on 80 percent of his body.
The personality of the fourth individual injured as reported by the military was not instantly clear.
Neighborhood media reported that the graffiti said "vengeance" and "long experience the Savior" and that the aggressors tossed firebombs inside the two homes, one of which was unfilled.
Israeli Safeguard Priest Moshe Yaalon said such assaults would not go on without serious consequences, including "we won't permit terrorists to take the lives of Palestinians."
The Israeli military said it was attempting to discover the culprits.