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The uprising against the Assad regime erupted in March 2011, and has resulted in the deaths of more than 20,000 people, according to the United Nations. Syrian activists say the death toll exceeds 33,000.

The international community has been divided on how to try and end Syria’s civil war. Russia and China have vetoed three U.N. Security Council resolutions on the matter.

Some Arab states have been arming the rebels. The U.S. has chosen to provide only nonlethal aid to the rebels.

Mr. Harb said the international community’s divided position has created an opportunity for extremists.

“I think that time is against the regime, but … time is against the democrats,” he said. “Bloodshed is in the interests of the fundamentalists. We are losing an opportunity, and I think the international community assume responsibility in giving this opportunity to the extremists.”

Meanwhile, an FBI team will travel to Lebanon to help in the investigation of Friday’s bombing, Mr. Toner said.