Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani, second left, speaks with European Union foreign policy chief Federica Mogherini, second right, during a meeting on the sidelines of a conference on 'Supporting the future of Syria and the region' at the EU Council building in Brussels, Wednesday, April 25, 2018. (Stephanie Lecocq, Pool Photo via AP)

Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani, second left, speaks with European Union foreign policy chief Federica Mogherini, second right, during a meeting on the sidelines of a conference on 'Supporting the future of Syria and the region' at the EU Council building in Brussels, Wednesday, April 25, 2018. (Stephanie Lecocq, Pool Photo via AP)

BEIRUT (AP) — Inspectors from the global chemical weapons watchdog made a second visit Wednesday to a Syrian town hit by an alleged chemical attack, collecting samples from a new location that will be sent to designated labs for analysis.

The suspected poison gas attack in Douma on April 7 has sparked an ongoing clash of narratives between the West and the governments of Syria and its key ally, Russia. Damascus and Moscow insist there was no chemical weapons attack.

A Syrian filmmaker accused Russian state media of using images from the set of his 2016 movie to claim that the attack was staged by the West.

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“I think it’s a desperate and cheap attempt by Russian TV to deny the obvious attack of Douma,” said Humam Husari, speaking of the images that appeared Sunday on two Russian state-run channels.

Opposition activists and first responders who witnessed the attack in Douma, which was under rebel control at the time, say it was carried out by government forces and killed more than 40 people, many of them suffocating in an underground shelter where they were hiding from government airstrikes. The U.S., France and Britain also blamed the Syrian government and launched joint punitive airstrikes targeting suspected Syrian chemical weapons facilities on April 14.

Syria’s government and Russia have denied responsibility for the chemical attack. They have repeatedly blamed the rebels and opposition activists for possessing and deploying chemical weapons.

Russia had even said the attack was staged. On Wednesday, Russian diplomats said they plan to bring evidence of this to the Organization of the Prohibition of Chemical Weapons. Russian Embassy spokesman Mikhail Sobolev said it would bring a group of 15 Syrians who they claim were filmed in “staged videos” of the alleged attack to a meeting at the OPCW on Thursday.

Russia’s Defense Ministry has also accused Britain of direct involvement in staging video images of alleged victims. Britain vehemently denied the accusation.

The OPCW said samples collected by its team in Douma will be sent to its labs for analysis. An earlier visit took place Saturday after the inspectors were delayed for days from getting to the town, just east of Damascus, for security reasons.

The inspectors’ visit to Douma and sample collection would allow the OPCW to proceed with an independent investigation to determine what chemicals, if any, were used.

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However, the OPCW is not mandated to fix blame for the attack. The mandate of a joint U.N.-OPCW body delegated to investigate such attacks has expired and Russia has vetoed its renewal. The joint body had found the Syrian government responsible for several previous attacks.

Husari, the Syrian filmmaker, denounced the use by Russian state-media of images from the set of his movie to push Moscow’s narrative that video showing the aftermath of the April 7 attack was faked.

He says Sunday’s reports by Russia’s Rossiya-1 and Channel One showed behind-the-scenes images from the set of his short film, “Kimawi,” Arabic for “chemical,” as it was being shot in the eastern Ghouta region in September 2016.

A segment on Rossiya-1 also shows an interview with Fares Muhammad Mayasa, identified as a former Army of Islam opposition fighter in Douma, who assisted on a film made by a Syrian director.

Husari told The Associated Press on Wednesday that Mayasa was involved in the production of the movie and was detained by security forces days after the attack, when the Douma rebels surrendered the town to Russian military police. He says some of the images from the set of the movie were probably found by security forces on his phone.

Thousands of Douma residents left the town after the attack while Russian military police and Syrian security forces deployed in the town, raising criticism from opposition activists that evidence may be tampered with.

Others have said that Douma residents who stayed in town under government control would be too afraid to challenge the Russian and Syrian narrative, fearing persecution.

Responding to Russian plans to visit its headquarters in The Hague with the Syrians, the OPCW said it has advised the Russian delegation that “these persons should be first interviewed” by the inspectors who are in Damascus.

“It was also recommended that such a briefing take place once the (fact-finding team) has completed its work,” the statement said. “Nevertheless, the Russian delegation stated that it would go ahead with the briefing and that its intention was not to interfere” with the work of the mission currently in Syria.”

The suspected attack and retaliation increased tension between the West and Russia.

On Wednesday, Russian Col. Gen. Sergei Rudskoi said Moscow will supply Syria with “new missile defense systems soon.” His statement did not specify the weapons, but the remarks follow Russian media reports that Moscow is considering selling its S-300 surface-to-air missile systems to Syria.

Top officials in Russia said it might reconsider its pledge a decade ago not to provide Syria with the S-300 system.

Transferring upgraded air-defense systems to Syria could be seen as an escalation by neighboring Israel, raising the risk of Israeli attacks.

Israeli Defense Minister Avigdor Lieberman said Tuesday if Syria uses Russian-made air defense missiles against Israel, the Israeli military would strike back.

“What’s important to us is that the defensive weapons the Russians are giving Syria won’t be used against us,” Lieberman told Israeli news website Ynet. “If they’re used against us, we’ll act against them.”

Israel has not taken sides in Syria’s civil war, but its air force has carried out dozens of airstrikes, most believed to have been aimed at suspected arms shipments to the militant Lebanese group Hezbollah, another key ally of Syrian President Bashar Assad. Israel also has warned that it will not accept a permanent military presence in Syria by Iran, also a staunch Assad supporter.

In Brussels, international donors on Wednesday pledged an estimated $4.4 billion in humanitarian aid for Syria and neighbors sheltering its refugees in 2018, falling well short of the more than $7 billion the U.N. is seeking.

An estimated 450,000 people have been killed in fighting in Syria since Assad’s government cracked down on demonstrations calling for his ouster in 2011.

Eight years into the conflict, more than 13 million Syrians are in need of humanitarian assistance; about a quarter of the population is displaced in neighboring Lebanon, Jordan and Turkey, according to the U.N.

U.N. humanitarian chief Mark Lowcock described the pledges as a “good start” and said he expected the amount to grow. Still, he said that given the funds available, the organization would have to save it for the most desperate cases.

With fighting still raging and the northern rebel-held province of Idlib in danger of becoming a new crisis zone, EU foreign policy chief Federica Mogherini urged Russia, Iran and Turkey to use their influence in Damascus, saying they have a “special responsibility” to establish a cease-fire and to press Assad to return to the negotiating table.

“We are seeing an escalation in military activities, which is exactly the contrary” to what they promised, Mogherini said.

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Associated Press writers Mike Corder in The Hague, Josef Federman in Jerusalem and Lorne Cook in Brussels contributed.