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.

Israel is still lacking evidence to charge those responsible for a deadly arson attack on a Palestinian family this summer, Israeli media reported the country’s defense minister as saying Monday, in a case that Palestinians say helped fuel the past weeks of bloodshed.

In July, assailants, believed to be Jewish extremists, lobbed a firebomb into the Dawabsheh family’s home in the West Bank village of Duma, where four family members were asleep. Ali Dawabsheh, a toddler, was burned to death, while his mother and father later died of their wounds. His 4-year-old brother Ahmad is being treated in an Israeli hospital.

Defense Minister Moshe Yaalon said a “group of Jewish fanatics” who want to install a “religious kingdom” based on biblical law were behind the attack. Yaalon’s remarks to military correspondents were reported by Israel’s Walla news site.

But Yaalon said, “We don’t currently have evidence that directly ties the one who carried out the terror attack but I believe we will get that, I hope that we will solve the case completely,” Yaalon said.

Israeli leaders across the political spectrum have strongly condemned the firebomb attack and vowed to apprehend the assailants. But the fact that no one has been officially charged months after the attack is a sore point among Palestinians and many cite the case as a big factor in fueling the current violence.