JERUSALEM, Dec. 12 (Xinhua) -- Two price tag attacks occurred overnight as vandals sprayed hate slogans on a monastery in Jerusalem and torched and spray painted a car in Ramallah, local news outlets reported Wednesday.

The perpetrators were not yet caught and security forces have reportedly started a probe into the incidents.

"Price tag" refers to acts of vandalism and violence perpetrated by Jewish settlers targeting Palestinians in the West Bank but also Christian sites, usually carried out in retaliation to the evacuation of West Bank settlements.

The Jerusalem monastery has already been targeted as part of a price tag incident in the past.

Last Week, Judea and Samaria police arrested three settlers in their early 20's who were caught red-handed trying to torch a Palestinian car. They were found with flammable materials, knives, explosives, spray paint and an M-16 rifle.

This is the fifth apparent price tag attack against Christian sties in the past year. Other incidents occurred at the Latrun Monastery, the Historical Baptist Church and the Dormition Abbey church.

In October, the Ha'aretz daily revealed that, in the past two years, only 23 indictments were filed against price tag vandals out of 170 documented cases.

In September, Internal Security Minister Yitzhak Aharonovich announced that the police would set up a special force to battle Jewish terrorism and price tag attacks.