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Brahimi hasn’t any mechanism to observe the situation,” Sieda said by phone from Stockholm, Sweden. “Now he is saying every side can do that (halt fighting) by itself.”

In Damascus, Syria’s deputy foreign minister, Faisal Mekdad, said the Assad regime is cooperating with Brahimi. “We are always optimistic,” he said when asked about the chances of a cease-fire.

However, Brahimi said after a visit to Damascus on Sunday that he did not get a commitment to the truce from the regime.

The relentless fighting in Syria has forced hundreds of thousands of people to flee the country to escape the violence.

The U.N. refugee agency said Tuesday that Lebanon has become the third Syrian neighbor to host more than 100,000 refugees from Syria’s civil war.

At least 101,283 people have registered as refugees in Lebanon, said agency spokeswoman Melissa Fleming. This compares to more than 105,000 in Jordan, at least 101,000 in Turkey, more than 42,000 in Iraq and 6,800 in North Africa.

Governments bordering Syria estimate tens of thousands more Syrian refugees have not yet registered, including an estimated 70,000 in Turkey who live outside refugee camps, she said.

Jordan alone says it hosting some 210,000 Syrian refugees, which Amman says has strained the country’s health care, water and electricity sectors.

Associated Press writers Bassem Mroue in Beirut, Albert Aji in Damascus, Syria, Suzan Fraser in Ankara, Turkey, and John Heilprin in Geneva contributed to this report.