Free Syrian Army soldiers are seen at the border town of Azaz, some 20 miles north of Aleppo, July 29, 2012. The U.N. said 200,000 Syrians have fled Aleppo since intense clashes between regime forces and rebels began 10 days ago. (AP Photo/Turkpix)
(CBS/AP) BEIRUT - Syria's top diplomat in London defected Monday, Britain's Foreign Office reported.
Khaled al-Ayoubi, the charge d'affaires, told officials that he wasn't willing to represent the regime of President Bashar Assad any longer.
The latest high-profile defection of a diplomat from Syria comes as thousands of civilians flee the nation's largest city, Aleppo, amid fierce battles between rebels and government forces.
The United Nations said 200,000 Syrians have fled Aleppo since intense clashes began 10 days ago.
The government forces turned mortars, tank and helicopter gunships against rebel positions Monday, pressing ahead with a counter-offensive to wrest back control of neighborhoods taken by rebels in Syria's largest city and commercial hub.
"I am extremely concerned by the impact of shelling and use of tanks and other heavy weapons on people in Aleppo," Valerie Amos, the top U.N. official for humanitarian affairs, said in a statement late Sunday. "Many people have sought temporary shelter in schools and other public buildings in safer areas," she added. "They urgently need food, mattresses and blankets, hygiene supplies and drinking water."
Amos said U.N. agencies and the Syrian Red Crescent are working together on supplying those affected by the fighting all over the country with blankets and humanitarian supplies, but many remain out of their reach because of the combat.
"It is not known how many people remain trapped in places where fighting continues today," she warned. Aleppo is Syria's largest city and commercial hub with about 3 million inhabitants.
Correspondent Clarissa Ward, who recently traveled with rebel forces in Syria, said Monday that "rebel forces are feeling very emboldened, particularly after the huge battles that have been taking place in Damascus and in Aleppo, the political and economic beating hearts of the regime. So they are feeling emboldened.
"They now also have huge swaths of territory, particularly in the north, but they are still outgunned and outmanned by the regime forces.