World powers began work Friday on the details of a temporary truce in war-ravaged Syria, but rebels and aid groups on the ground were skeptical that the "ambitious" deal could be implemented, NBC News reported.
The agreement, which followed talks between U.S., Russia and more than a dozen other countries, calls for a "cessation of hostilities" within one week and the immediate expansion of humanitarian supplies.
Secretary of State John Kerry hailed the results but noted "the real test is whether or not all the parties honor those commitments and implement them in reality."
Opposition groups welcomed the agreement with caution, there must be a visible different on the ground before they could work towards a permanent peace deal in Geneva.
"We have no faith in words any longer, it's only concrete action that will make a difference to Syrians' lives at this dark time," Issam al-Reis, spokesman for the Free Syrian Army's southern front said.
