Syria's crisis began in March 2011 with largely peaceful protests against President Bashar Assad, and slowly turned into an insurgency and then a full-blown civil war. More than 100,000 people have been killed in the conflict, while another 2 million have sought refuge from the violence abroad.
The fighting also has destroyed the country's cities and shattered much of its economy, including its infrastructure.
Syria's state news agency said a blackout hit much of the country following an attack late Wednesday that damaged the gas pipeline supplying power stations in the nation's south.
SANA quoted Electricity Minister Imad Khamis as saying maintenance crews were working to restore power. The minister blamed the attack on "terrorists," a term the government uses to refer to those trying to topple Assad.
It was not immediately clear how extensive Wednesday's blackout was.
Damascus and southern Syria have been struck by several major power outages over the course of the country's civil war. Many rebel-held parts of the country have been without power for months.
North of Damascus, rebels and government forces clashed for the third consecutive day Wednesday in the Christian town of Sadad, forcing desperate residents to flee.
The Observatory said fighters from the two al-Qaida-linked groups, Jabhat al-Nusra and the Islamic State in Iraq and the Levant, captured a checkpoint that gave them control of the western part of the town. It said frightened residents were heading north to the central city of Homs some 55 kilometers (35 miles) away.
The rebels appear to have targeted Sadad because of its strategic location near the main highway north from Damascus rather than because it is inhabited primarily by Christians. But Islamic extremists among the rebels are hostile to Syria's Christians minority, which has largely backed Assad during the conflict. Other al-Qaida-linked fighters have damaged and desecrated churches in areas they have overrun.
In The Hague, the organization tasked with overseeing the destruction of Syria's chemical weapons program said its inspectors have visited 18 out of 23 sites declared by the government. The group said it expected to meet a Nov. 1 deadline to make all of the declared chemical weapons production facilities in the country inoperable.
Three teams of inspectors from the Organization for the Prohibition of Chemical Weapons had carried out "functional destruction activities" at almost all the sites, spokesman Michael Luhan said. The teams of inspectors have had "good access" to sites so far, and the Syrian government was cooperating, he said.
The OPCW is racing to meet the mid-2014 deadline set by the U.N. Security Council for ridding Syria of its chemical weapons. It is the tightest deadline in the organization's history, and the job is made all the more difficult by having to navigate a bloody civil war.
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Associated Press writer Mike Corder in The Hague, Netherlands, contributed to this report.
