Syrian rebel fighters pose for a picture in Hama
Rebels fighting to topple Syrian President Bashar al-Assad declared Damascus International Airport a battle zone on Friday, warning civilians and airlines they would approach it "at their own risk".
Fighting around the capital city has intensified over the past week, prompting predictions among Western opponents of Assad that an endgame is approaching in a 20-month-old conflict that has killed 40,000 people, reports Reuters.
"Events on the ground in Syria are accelerating, and we see that in many different ways," U.S. Secretary of State Hillary Clinton said before talks on Thursday with Foreign Minister Sergei Lavrov of Russia, which has backed Assad.
"The pressure against the regime in and around Damascus seems to be increasing," Clinton said in Dublin.
Syria's government says that is not the case, and that the army is driving rebels back from positions in the suburbs and outskirts of Damascus where they have tried to concentrate their offensive.
Many who have followed the events on the ground say talk of an endgame is overblown or premature.
"I think it's unreasonable to expect that the battle is in its last stages right now," said Rami Abdelrahman of the Syrian Observatory for Human Rights, which has tracked the fighting since it began in March 2011.
"The big advances are only in the media. The situation is certainly not good, for anyone. The Syrian economy is dead. But conditions for the rebels are not good either ... Rebel-held parts of Aleppo are barely eating and are always at risk of army shelling."