The international peace envoy for Syria has said that the situation in the country is deteriorating sharply.
He added that a solution was still possible in 2013 under the terms of a peace plan agreed in Geneva in June.
Lakhdar Brahimi said during a news conference at the Arab League in Cairo: "that the solution must be this year: 2013, and, God willing, before the second anniversary of this crisis,"
"A solution is still possible but is getting more complicated every day," he added.
Meanwhile, activists say Syrian rebels have captured an oil pumping station in the north of the country after days of fighting.
The station receives crude oil from the nearby province of Hassakha then pumps it to the central region of Homs, home to one of Syria's two oil refineries.
Rebels have captured in the past months several oil fields in the eastern province of Deir el-Zour that borders Iraq.
Syria's conflict which began in March last year has killed more than 40,000 people.
Separately, Jordan says it is prepared to deal with any potential chemical weapon threat posed by the ongoing violence in neighbouring Syria, but adds it will not enter "any alliance" to protect itself.
Jordan, the US and others have expressed concern that Syrian President Bashar al-Assad could use chemical weapons in a last-ditch effort to save his regime.