The Internet is down across Syria and telephone communications have been disrupted as fighting between government troops and rebels against President Bashar al-Assad's regime intensifies.
Two U.S.-based Internet tracking services have confirmed that all Internet traffic stopped on November 29.
The government and the rebels blame each other for the outage.
It is the first nationwide Internet blackout since the 20-month-long uprising began.
Activists say the government appears to be preparing for a major offensive against rebel strongholds around Damascus.
On November 29, intense fighting outside the capital blocked the highway to the international airport.
The government later said troops had cleared the highway of "terrorists" but the rebels said the fighting was continuing.
The fighting prompted two airlines -- Emirates and EgyptAir -- to suspend flights to Damascus.
Based on reporting by Reuters, AFP, and AP