Blast rocks U.N. mission in Baghdad
Suicide bomber demolishes corner of complex, at least 10 dead

A powerful bomb sparked an explosion at the United Nations headquarters in Baghdad killing at least 10 people and injuring scores of others, including the top U.N. official in Iraq.

Witnesses said a man driving a cement-mixer truck blasted his way through the walled complex and blew up inside the lobby of the building.

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Emergency crews are searching sections of the structure that collapsed to rescue the dozens feared buried under the rubble.

U.N. spokesman Fred Eckhard said as many as 300 workers of several nationalities, including Iraqi, could have been inside the building at the time of the explosion. Sergio Vieira de Mello, the U.N. special representative to Iraq, was among those evacuated.

"He has been injured, but we're not certain how badly. He appears to be conscious; they are giving him water," Eckhard told CNN.

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Today's bombing mirrors that at the Jordanian Embassy in Baghdad earlier this month which killed 11 people and wounded more than 50 others.

It also comes on the heels of attacks on other "soft targets" not secured by coalition forces, including an oil and a water pipeline.