Russia and France disagreed radically yesterday over a report by UN investigators into a chemical weapons attack that killed hundreds of people in Syria, highlighting the problems of agreeing on action at the United Nations Security Council.

Sitting beside French Foreign Minister Laurent Fabius at a news conference in Moscow, Russian Foreign Minister Sergei Lavrov said the report had produced no proof that President Bashar al-Assad’s troops carried out the August 21 attack and that Russia still suspected rebel forces were behind it.

Fabius took the opposite view, saying the report left no doubt that Assad’s forces were to blame for the attack which Washington says killed more than 1,400 people.

The United States has also blamed Syrian government forces.

We have reason to believe this was a provocation

Lavrov acknowledged that the investigators’ report proved that chemical weapons had been used but that “there is no answer to a number of questions we have asked”, including whether the weapons were produced in a factory or home-made.

“We have very serious grounds to believe that this was a provocation,” Lavrov said after talks in Moscow between two countries with veto powers in the UN Security Council.

He said there had been “many provocations” by the rebels fighting Assad’s government and added: “They were all aimed, over the last two years, at provoking foreign intervention.”

Lavrov said the UN report should be examined not in isolation but along with evidence from sources such as the internet and other media, including accounts from “nuns at a nearby convent” and a journalist who had spoken to rebels.

“We want the events of August 21 to be investigated dispassionately, objectively and professionally,” he said.

After Lavrov spoke, Fabius, whose country has stood with US President Barack Obama in backing military action against Syria, challenged Lavrov’s interpretation by saying the result of the report was clear.

“When you look at the amount of sarin gas used, the vectors, the techniques behind such an attack, as well as other aspects, it seems to leave no doubt that the regime is behind it,” Fabius said.

Human Rights Watch said rocket trajectories detailed in the UN report suggested they had been fired from a base belonging to the Republican Guard, run by Assad’s brother Maher.

Drawing lines of presumed rocket flight paths back from two sites on opposite sides of the Syrian capital that were struck on Aug. 21, it said they converged in the hills north of central Damascus where the Republican Guard 104th Brigade is based.

“The Sellstrom report revealed key details of the attack that strongly suggest the government is to blame, and may even help identify the location from which the Sarin-filled rockets that killed hundreds of people ...were fired,” it said.

“This isn’t conclusive, given the limited data available to the U.N. team, but it is highly suggestive and another piece of the puzzle,” the group said.

Lavrov and Fabius agreed there should be a renewed push for a political solution in Syria. The Russian minister also thanked France for supporting a US-Russian deal which calls for Syria to account fully for its chemical weapons within a week and for the removal and destruction of the entire arsenal by mid-2014.

But the differences over culpability for the August 21 attack indicated the hurdles faced in turning the chemical weapons agreement into progress towards ending a civil war that has killed more than 100,000 people since March 2011.

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