The Palestine Liberation Organization (PLO), the terrorist organization behind Fatah and the Palestinian Authority (PA), is to appeal to the UN Security Council over Israel’s announcement that it would build 1,500 new Jewish homes in Judea, Samaria, and Jerusalem, a senior official said Thursday.

“The executive committee of the PLO views this latest escalation with the utmost of seriousness,” Hanan Ashrawi said in an English-language statement.

The committee  “will counter it by addressing both the United Nations Security Council and the General Assembly as the proper way of curbing this grave violation and ensuring accountability,” she added.

Earlier Thursday, the PA vowed to take “unprecedented steps” in revenge for the announcement, though officials did not specify what those steps were. 

Once the announcement was made, the PA issued a sharp condemnation of the announcement,calling on the US to take “serious steps” against Israel over the move. 

PA officials also accused Prime Minister Binyamin Netanyahu of being a “liar” who is “not interested” in peace.

“It is time for the American administration to take serious steps against what the government of Israel is doing,” Nimr Hammad, an adviser to PA Chairman Mahmoud Abbas, told AFP. “We strongly condemn this decision which affirms that Prime Minister Benjamin Netanyahu is a liar and is not interested in the two-state solution.”