Anti-Arab graffiti was found spray-painted at a building site outside Jerusalem, another incident in a spate of race-hate “price tag” attacks by suspected Jewish extremists.

Authorities opened an investigation Sunday into graffiti found at a construction site in Kiryat Ye’arim, also known as Telz Stone, a predominantly ultra-Orthodox Jewish community near Jerusalem adjacent to the Arab town of Abu Ghosh.

The overnight guard at the construction site said that he left the area for around two hours, and when he returned he found the graffiti, the Maariv daily reported.

The words “price tag” and “Kahane was right” were found spray-painted on a tractor.

Price tag refers to vandalism and other hate crimes usually carried out by Jewish ultra-nationalists in retaliation for government policies against the settler movement, often but not always, against Arab property.

Rabbi Meir Kahane was a Jewish ultra-nationalist who founded the Kach party, which was later banned as racist, before being assassinated in 1990. “Kahane was right” refers to his anti-Arab policies.

Price tag attacks have become increasingly common in recent weeks. Earlier Sunday morning, police clashed with residents of the Yitzhar settlement in the West Bank as they arrived to investigate a suspect in recent attacks, and on Saturday, over 30 olive trees in the West Bank Arab village of Nahalin were found to have been uprooted.

A spate of “price tag” attacks in northern Israel last week saw mosques vandalized and dozens of cars found with slashed tires.