Two Palestinians were wounded as dozens clashed with Israeli soldiers Saturday in front of an Israeli prison near the West Bank city of Ramallah, witnesses said.

Israeli soldiers used tear gas, in addition to rubber bullets, to repress the demonstrators, leaving 13 suffering from the gas, the witnesses added.

The demonstrators gathered in solidarity with Khader Adnan, a Palestinian hunger striker since he was arrested without a charge on Dec. 17, 2011.

The protestors threw rocks at the Israeli soldiers and called for the release of Adnan, who is an Islamic Jihad official.

Ziad Abu Ein of the prisoners' affairs ministry warned that Adnan's life might be at risk after 56 days on hunger strike.

He added that the Palestinian National Authority holds intensive contacts with Arab and international sides to press Israel to release Adnan.

International rights groups urged Israel to either release or charge Adnan.