BAGHDAD, (AP) – A bomb rocked Iraq’s parliament building in the heavily fortified Green Zone Thursday, killing at least two lawmakers in a stunning security breach in the third month of a U.S.-Iraqi crackdown on violence in the capital, officials said.

At least four other people were wounded in the blast, which shook a cafeteria while several lawmakers were eating lunch, initial media reports said.

Mohammed Awad, a member of the Sunni National Dialogue Front, was killed in the blast, said Saleh al-Mutlaq, the leader of the party, which holds 11 seats in Iraq’s legislature.

A security official at the parliament building said a second lawmaker, a Shiite member, also was killed. He spoke on condition of anonymity because he was not authorized to speak to the media.