Photos of Toddler Ali Dawabsheh lie in his family house which was torched in an attack by Jewish settlers in Duma village near the West Bank city of Nablus on July 31, 2015.

Members of a “Jewish terror group” have been arrested over an arson attack on a Palestinian home in the Israeli-occupied West Bank that killed a toddler and his parents, Israeli police have said.

A police statement did not say how many suspects were in custody. It said a court order banning disclosure of their names and other details of the case was in effect.

Eighteen-month-old Ali Dawabsheh was killed in the July 31 blaze in Duma, a village outside Nablus.

His father, Saad Dawabsheh, succumbed to the burns he suffered in the fire on Aug. 9, and the baby’s mother, Riham, died in hospital four weeks later. Ali’s four-year-old brother remains in hospital.

The police statement said “youths belonging to a Jewish terror group” suspected of carrying out attacks on Palestinians were arrested over the past few days, and there were “solid suspicions” linking them to the arson at the Dawabshehs’ home.

Palestinian anger over the attack has been a factor fueling a wave of violence that erupted on Oct. 1.

Israeli leaders pledged after the Dawabsheh toddler’s death to crack down on violent far-right Jewish groups, and the government decided to start detaining without trial Israeli citizens suspected of political violence against Palestinians.