Syrian forces launched a major offensive in Damascus near the country's international airport Thursday, and the government shut down Internet access across the country and slashed cell phone services in selected areas.
The army attacked rebel strongholds in a string of towns along the airport road. A rebel fighter said insurgents were not inside the airport but were able to block access to it.
The Britain-based Syrian Observatory for Human Rights said the heaviest clashes erupted between troops and rebels in the towns of Babila and Hujaira, southeast of the capital, and in Harran al-Awamid, just east of the airport.
The fighting, which came after Internet links went down, caused EgyptAir and Emirates airline, based in Dubai, to suspend flights to Damascus.
The wholescale Internet blackout, confirmed by two U.S.-based companies that monitor online connectivity, is unprecedented in the 20-month-long uprising against Syria's President Bashar al-Assad. Authorities often cut phone lines and Internet access in areas where government forces are conducting major military operations.
A pro-government television station quoted Syria's minister of information as saying "terrorists," not state agents, were responsible for the countrywide outage.
The British-based Observatory said rebel units launched a new offensive in the country's north, trying to take a military base near the main highway to Syria's commercial capital of Aleppo. The Observatory said rebel forces in Idlib province began moving on Wadi al-Deif early Thursday.
Opposition activists have been voicing increasing optimism that rebel forces are making gains and maintaining their positions against government forces. Some point to recent successful attacks against government warplanes and helicopters as evidence the conflict's momentum may be shifting.
There are also renewed allegations that Syrian rebels are using child soldiers in their efforts to overthrow the Assad government.
Human Rights Watch said children as young as 14 have served in rebel brigades, acting as lookouts and transporting weaponry. The human rights organization said some have even taken part in combat.