Two masked attackers early on Wednesday broke into a Palestinian family's home in the South Hebron Hills and threw firebombs, damaging property, the family said.
No one was injured. The Judea and Samaria district police's nationalist-crimes division has opened an investigation into the incident.
The residents of Khirbet Carmel said they heard a noise in the living room. When they went to investigate, two masked men threw firebombs and ran away.
On the home were sprayed the word "revenge" and another word that might be "kingdom," the family said.
The head of the Hebron Regional Council, Yochai Damari, said the council is "in close contact with the military to determine exactly what occurred there."
He called on everyone concerned to wait for the results of the inquiry. He cautioned that in the past settlers had been accused of causing damage and destruction and an inquiry proved they had done no such thing.
"We condemn every form of violence," Damari said. At the same time, "we call for responsible media coverage and an inquiry into every incident."
In November Palestinian reports said that settlers set fire to a mosque in the village of Mughayer. Worshipers arriving for morning prayers put out the fire. Israeli firefighters subsequently determined that a fire at a mosque in early November was an electrical fire, rather than an act of arson as was previously believed.
A month earlier, vandals torched a mosque in the West Bank village of Aqraba, damaging the structure and its door and smashing windows.
Eyewitnesses said that Israeli settlers arrived at the Abu Bakr mosque compound after midnight, spray-painted graffiti using the words "price tag" and "Kahane."
They then poured gasoline on the first floor of the mosque – the women's prayer area - and set it on fire.
The reference to Kahane is to the Brooklyn-born right wing rabbi Meir Kahane. The term "price tag" is used by extremist residents of the territories to warn that the Arabs will pay a price for terror.
This article was amended on 1.1.2015 to include the findings of Israeli firefighters, who investigated the fire at a mosque in Mughayer in November.