The mother of a Palestinian toddler killed in a July arson attack on a West Bank home died on Monday of burns, the third victim after her husband died last month.

Suspected Jewish attackers torched the home of Saad Dawabsheh in the West Bank village of Duma on July 31, killing his 18-month-old son, Ali. Saad died on Aug. 9 and mother Riham, 27, on Monday.

"To my regret, she passed away after midnight," a spokeswoman said.

A second son was also hospitalized in serious condition.

Israeli Prime Minister Benjamin Netanyahu described the attack as an act of terrorism and his security cabinet has ordered a crackdown on violent far-right Jewish groups in a similar vein to actions taken against Palestinian suspects.

The government has allowed harsher interrogations of suspected Jewish militants with methods once reserved for Palestinians and has also started detaining citizens suspected of political violence against Palestinians without trial.

After the previous two family funerals, Palestinians rallied in their home village of Duma in the northern West Bank, calling on militant factions to take revenge.