JERUSALEM (JTA) — A home in a Palestinian village near Ramallah was attacked with two smoke grenades in what is believed to be an attack by Jewish extremists.

The attack took place early on Tuesday morning. A nine-month-old boy and his parents were sleeping in the house at the time of the attack; none were hurt in the attack, according to reports.

The words “revenge” and “greetings from the prisoners of Zion” were drawn on the side of the home in the West Bank village of Beitillu. The graffiti appears to refer to the July 31 attack on a home in the Palestinian village of Duma, which killed 18-month-old Ali Dawabsheh and his parents, Saad and Reham. The one surviving member of the family, Ahmed, 4, is still undergoing treatment in an Israeli hospital.

Several alleged Jewish extremists remain in Israeli prisons suspected of being involved in the Duma firebombing. The suspects are being held without formal charges in administrative detention, a practice generally limited to terror cases, and some claim that they have been tortured during interrogations.

An investigation has been opened into Tuesday’s attack.

Husain al Najjar, the father of the family whose house was attacked, said his home also was attacked a year ago, by people he identified as “settlers,” in an interview with Army Radio.