Western nations and Russia on Friday put forward rival U.N. Security Council resolutions on sending ceasefire observers to Syria as they wrangled over conditions for the mission.

The dispute after two days of tough negotiations means no vote is likely until Saturday on any final resolution which would allow an advance party of 30 unarmed military observers to go to Syria next week.

The Syrian Ambassador to Lebanon Ali Abdul Karim Ali stated on Friday that Damascus is serious in its investigation to uncover the truth behind the death of al-Jadeed television cameraman Ali Shaaban.

He said: “The Syrian army could not have been behind the heavy shooting at the television crew.”

Syria must allow humanitarian access to aid those in need after 13 months of deadly violence, a spokesman for international peace mediator Kofi Annan said on Friday.

"Mr. Annan is aware that we don't have a perfect situation in the country at the moment," his spokesman Ahmad Fawzi said on day two of a shaky ceasefire introduced under a peace plan drawn up by Annan, the U.N.-Arab League envoy to Syria.

International aid for Syrians fleeing President Bashar al-Assad's crackdown has begun to arrive in Turkey, its foreign minister said Friday amid concern over growing refugee numbers.

"We will start getting international aid, and in fact we have already started," after swelling numbers of refugees who turned up at Turkish-Syrian border, Ahmet Davutoglu told reporters in Istanbul.

Russia will keep a permanent naval presence off Syria's coast to match the growing number of Western warships monitoring the 13-month crisis, a top defense official said on Friday.

"A decision has been taken to keep Russian navy ships permanently stationed near Syria's coast," the RIA Novosti state news agency quoted a senior defense ministry official as saying.

Thousands of Syrians marched on Friday to test the regime's commitment to a U.N.-backed peace plan, and the fragile two-day old ceasefire was again shaken when security forces killed 10 civilians and an army deserter.

The Local Coordination Committees, the main activist group spurring protests on the ground, said security forces killed three protesters in Daraa, two protesters in Hama, two people in Idlib, two protesters in Aleppo, a demonstrator in the Damascus suburb of Daraya and a rebel soldier in al-Hassakeh.

French President Nicolas Sarkozy said Friday that he did not believe in the sincerity of Syrian leader Bashar Assad, nor in the U.N.-backed ceasefire aimed at halting 13 months of bloodshed.

"I do not believe in Bashar Assad's sincerity, nor unfortunately in the ceasefire. I think... we must absolutely deploy observers so that at the very least we know what is happening," he told French television I-Tele.

Clashes between the Syrian army and rebel fighters broke out Friday for the first time since a hard-won U.N.-backed ceasefire came into force a day earlier, a monitoring group said.

"Fighting with heavy machineguns took place in Khirbet al-Joz, located on the Turkish border, between regime soldiers and (army) deserters," Rami Abdel Rahman of the Syrian Observatory for Human Rights told Agence France Presse.

France has "elements of evidence" that crimes against humanity have been committed by the Syrian regime, French Foreign Minister Alain Juppe said Thursday.

"France has gathered a certain number of elements of evidence which would enable us if the time comes, notably at the U.N., to take it before the international courts, because crimes against humanity have been committed," he told reporters on the sidelines of a meeting of G8 ministers.

Turkish Prime Minister Recep Tayyip Erdogan Thursday accused the Syrian regime of failing to abide by the ceasefire and peace plan hammered out by U.N.-Arab League envoy Kofi Annan.

"There's a six-point plan put forward by Annan... Is it being implemented? I'm not of the opinion it is being implemented," Erdogan told reporters before leaving for Saudi Arabia where he was to have talks on the Syrian crisis.