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The U.N. team that will carry out the investigation arrived in Syria last week to look into three earlier purported chemical attacks. The mission is led by Swedish expert Ake Sellstrom.

Meanwhile, Syrian state TV said a car bomb killed the governor of the central province of Hama on Sunday. Anas Abdul Razaak Naem was assassinated in the Jarajima neighborhood of the city of Hama, the provincial capital, it said. No further details were immediately available.

Assassinations of politicians, army officers and journalists who support Mr. Assad’s regime are commonplace in Syria’s civil war. At least 100,000 people have been killed in Syria since the country’s crisis began in March 2011.

• Associated Press writers Jamey Keaten in Paris and Kimberly Dozier in Washington contributed to this article.