Kofi Annan, the United Nations-Arab League special envoy on Syria, has received a letter from Damascus saying President Bashar al-Assad's government has accepted Annan's plan to end the country's crisis.
Annan's plan calls for an immediate end to the violence, humanitarian access to besieged areas, and the start of talks between the government and opposition.
But the U.S. ambassador to Syria, Robert Ford, expressed skepticism about the letter -- saying it would be best to look for action, not words, from Assad.
Ford also said he has received reports that armed Syrian opposition groups are abusing human rights as well as Syrian government forces.
The United Nations says more than 9,000 people have been killed in violence in Syria since protests against Assad's regime began one year ago.
With AFP, dpa, and AP reporting