International mediator Kofi Annan's deputy told the U.N. Security Council on Wednesday that Syria's 14-month-old uprising is unlikely to stop without political negotiations between the government and opposition, U.N. diplomats said.
"(The) uprising in Syria has the characteristics of a revolutionary movement," a diplomat told Reuters on condition of anonymity, summarizing remarks Annan's deputy Jean-Marie Guehenno made to the 15-nation council.
Another diplomat confirmed Guehenno made the remarks.
"People have lost (their) fear and are unlikely to stop their movement," the first diplomat said, adding that Guehenno also said that "direct engagement between government and opposition (is) impossible at the moment."
Meanwhile,the head of U.N. observers in Syria, Major-General Robert Mood, said on Wednesday 13 bodies had been discovered in the east of the country, with their hands tied behind their backs and signs that some had been shot in the head from close range.
"General Mood is deeply disturbed by this appalling and inexcusable act," a statement issued by the observer mission said. "He calls on all parties to exercise restraint and end the cycle of violence for the sake of Syria and the Syrian people."
Meanwhile, the U.N. Human Rights Council will hold a special session on Syria in Geneva on Friday to probe last week's massacre of more than 100 people in the town of Houla, diplomats involved in planning the meeting in Geneva said on Wednesday.
The United States, Qatar, Turkey and the European Union led the push for the emergency debate, the U.N. rights body's fourth special session on Syria since unrest broke out in the country early last year.
Scheduling the debate, which has not yet been officially announced, requires signatures of 16 countries that are members of the Human Rights Council.
"It's all materialising very quickly," said one official. "It's going to have huge support."
Some members plan to draft a text that is likely to condemn Friday's Houla massacre, in which at least 108 people were killed, and demand further investigation.
The massacre, a clear breach of a ceasefire deal brokered by international envoy Kofi Annan, has already prompted at least seven Western nations to expel Syria's envoys from their capitals.
The European Union is likely to press the Human Rights Council to recommend the U.N. Security Council refer the case to the International Criminal Court (ICC).
"It should be a strong, robust resolution because what has happened is just intolerable," one EU diplomat said.
China and Russia, which have the power to veto any U.N. sanctions against Syria, have refused to blame forces loyal to Syrian President Bashar al-Assad for the Houla killings, so the widespread outrage is unlikely to translate into tough action on the Syrian government.
In the Human Rights Council's last debate on Syria, 41 of the 47 members backed a resolution criticising Syria. Only Russia, China and Cuba voted against.
One month earlier, Syria's ambassador stormed out of the Council during an emergency debate on Syria, blaming foreign countries for inciting sectarianism and providing arms to the opposition in Syria.