TEHRAN, May 17 (Xinhua) -- Iran's Supreme Leader Ayatollah Ali Khamenei said here Thursday that Washington has been a partner of Tel Aviv's recent "crime" against Palestinians.

"Al-Quds (Jerusalem) is the capital of Palestine and it will be liberated from the enemies with God's help," Khamenei said according to the leader's official website.

He urged the Islamic countries "to take stance against these crimes."

Iranian President Hassan Rouhani on Wednesday slammed what he called the "silence" of some Arab states and Islamic countries following the killings of Palestinian protesters by Israel.

The United States and Israel will virtually be surrendered to the will of the Muslims, Khamenei stressed.

Israel launched deadly attack in the Gaza Strip on Monday when Israeli forces opened fire on Palestinians who were protesting against the inauguration of the U.S. embassy in Jerusalem, killing dozens of Palestinians and injuring many others.