Iraqi lawmakers have expressed condemnation and resolve during a special session following Thursday's bombing at the parliament building.
Many lawmakers returned to the shattered building inside Baghdad's Green Zone for a rare Friday gathering to offer prayers for the dead and to call for unity.
The apparent suicide bombing in the assembly's cafeteria killed Sunni Arab deputy Mohammad Awad (of the National Dialogue Party) and injured about 20 other people.
An insurgent group linked to al-Qaida called the Islamic State of Iraq has claimed responsibility for the bombing in a statement posted on an Islamist Web site.
The U.S. military initially said eight people were killed in the explosion, but the military now says it can only confirm one death.
An investigation into the attack is under way.
The second-ranking U.S. general in Iraq, Ray Odierno, acknowledged that Thursday was "a very bad day." He insists steady progress is being made on improving security.