BAGHDAD, Iraq (CNN) -- At least two people were killed early Saturday in a rocket attack near a U.N. compound in Baghdad's Green Zone, an official with the United Nations mission in Iraq said.
The two victims worked for a catering company supporting the U.N. facilities in the Green Zone, the United Nations said. Fifteen people were injured but no U.N. or international staff members died or were reported injured.
Camp Victory, the U.S. military base near Baghdad International Airport, was also attacked with rockets early Saturday. There was no immediate word on casualties.
The U.S. military said it believes Iranian-made rockets were used in both attacks.
U.N. Secretary-General Ban Ki-moon was "shocked and saddened" by the attack, his spokesperson said.
"He strongly condemns the attack and expresses his condolences to the families of victims and wishes speedy recovery to the injured catering staff working for the U.N," the spokesperson said.
Shiite militias are usually behind rocket and mortar attacks on the Green Zone. The heavily fortified Green Zone is the common name for the International Zone in central Baghdad, home to government and agency offices and many Westerners.
The United States has said Iran funds, trains and arms anti-American "special groups," the U.S. term for splinter factions of radical Shiite cleric Muqtada al-Sadr's Medhi Army.
Iran denies the U.S. accusations that it is supporting insurgent factions within Iraq.
Two days before the attacks, Iraq's parliament approved a security agreement with the United States that allows American troops to remain in the country for three more years.
Friday, al-Sadr followers filled the streets of his stronghold in Baghdad's Sadr City to protest the agreement.
The Sadrists vehemently oppose the deal because they want U.S. troops out of Iraq immediately. The 30 Sadrist lawmakers in parliament staged loud protests against the measure during debates.
During Friday prayers in Sadr City, Sheikh Hussein al-Husseini condemned the parliamentary vote ratifying the "cursed agreement." He read a message from al-Sadr announcing three days of mourning because the legislation was passed.
Some worshippers torched U.S. flags and peaceful protesters chanted against the government.
The three-person presidency council, made up of the Kurdish president and the Sunni and Shiite vice presidents, needs to approve the U.S.-Iraqi proposal.
Elsewhere in Baghdad, a bomb attached to a vehicle in the central part of the city killed the driver and wounded two others, the Interior Ministry said.
The U.S. military refers to bombs attached to civilian vehicles without the driver's knowledge as "sticky bombs."
Separately, a bomb attached to the vehicle of a police officer detonated, wounding the officer and two bystanders in northern Baghdad's al-Ataifiyya neighborhood, the Interior Ministry said.
Also, three rockets struck a residential district in Kut, killing one civilian and wounding four, the Interior Ministry said. Kut is the provincial capital of the predominantly Shiite province of Diwaniya.
CNN's Jomana Karadsheh contributed to this report.