The seven al-Shabab militants were from what the militia called its martyrdom, or suicide, brigade. They all died in the assault, an official said, bringing the overall death toll to at least 16.
The attack comes only six months after the United Nations expanded its presence in Mogadishu, where it had kept only a small operation because Islamic insurgents had controlled much of the capital until being pushed out in an offensive in 2011.
African Union and Somali security forces responded and took control of the compound by 12:30 p.M. The UN staff who sought refuge in the compound's secure bunker then were evacuated to the secure military base and airport complex across the street, said Ben Parker, a spokesman for the United Nations Assistance Mission in Somalia.
Two South Africans from the company Denel Mechem who were doing demining work for the UN died in the attack, said Vuyelwa Qinga, a spokeswoman for Denel, a manufacturer of defense equipment.
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"There was not very much time to get into the safe area," said Parker.
The top UN official on Somalia, Nicholas Kay, also works out of the building but was not inside the compound when it was attacked. Kay said he was shocked and horrified by the attack.
"The United Nations Common Compound houses UN personnel working on humanitarian and development issues for the Somali people. This was an act of blatant terrorism and a desperate attempt to knock Somalia off its path of recovery and peace building," said Kay.
Speaking to the UN Security Council today, Deputy Secretary-General Jan Eliasson called the attack outrageous and said the UN remains committed to achieving peace and keeping Somalia on its path to recovery.
At 11:30 am the compound was rocked by the car bomb blast that blew down the compound's front gate. At least two other blasts followed, Parker said.