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UN Mideast envoy concerned that Israel hasn't caught arsonists behind deadly West Bank attack

  • Palestinian security officers carry the body of Riham Dawabsheh, 27, during her funeral procession in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)

    Palestinian security officers carry the body of Riham Dawabsheh, 27, during her funeral procession in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)  (The Associated Press)

  • Palestinian women cry during the funeral procession for Riham Dawabsheh, 27, in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)

    Palestinian women cry during the funeral procession for Riham Dawabsheh, 27, in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)  (The Associated Press)

  • A Palestinian boy walks by the graves of Riham Dawabsheh, 27, front, her husband Saed Dawabsheh, center, and her 18-month-old son Ali, following her funeral procession in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)

    A Palestinian boy walks by the graves of Riham Dawabsheh, 27, front, her husband Saed Dawabsheh, center, and her 18-month-old son Ali, following her funeral procession in the West Bank village of Duma, near Nablus, Monday, Sept. 7, 2015. The mother of a Palestinian toddler killed in a West Bank firebomb attack was buried in her village Monday hours after succumbing to wounds sustained in the attack, which also killed the child's father and is believed to have been carried out by Jewish extremists. (AP Photo/Nasser Nasser)  (The Associated Press)

The U.N. envoy to the Middle East has expressed concern over what he described as Israel's "lack of progress" in apprehending suspected Jewish extremists responsible for a July arson attack that killed a Palestinian couple and their toddler.

Nickolay Mladenov called for "justice" in a statement released after 27-year-old Rihan Dawabsheh died early Monday of her wounds from the attack. Her husband Saad died earlier while their 18-month-old son Ali was burned to death in the attack.

The couple's 4-year-old son Ahmad is still undergoing treatment at an Israeli hospital.

The attack drew widespread condemnation and Israel pledged to get tougher on Jewish extremists in the West Bank suspected in attacks on Palestinians and their property.

Israeli authorities have not yet arrested or identified suspects in the July arson attack.