* Warplanes hammer Eastern Ghouta, southern Idlib
* UN probes alleged gas attacks on Ghouta, Idlib civilians
* UN representatives in Syria urge immediate truce
* Insurgent shelling kills three in Damascus
* Erdogan says US calculating against Turkey, Russia, Iran
* Syrian army boosts air defences in northwest - commander
The United Nations called on Tuesday for an immediate humanitarian ceasefire in Syria of at least a month, as heavy air strikes were reported to have killed dozens of people in the last major rebel stronghold near Damascus.
Separately, UN war crimes experts said they were investigating multiple reports of bombs allegedly containing chlorine gas being used against civilians in the rebel-held towns of Saraqeb in the northwesterly province of Idlib and Douma in the Eastern Ghouta suburbs of Damascus.
The Syrian government denies using chemical weapons.
The Syrian Observatory for Human Rights said Tuesday's bombardment of Eastern Ghouta had killed at least 41 people. A local official, Khalil Aybour, put the toll at 53.
On Monday, air strikes killed 30 people in Eastern Ghouta, the Observatory said.
"Today there is no safe area at all. This is a key point people should know: there is no safe space," Siraj Mahmoud, the head of the Civil Defence rescue service in opposition-held rural Damascus, told Reuters.
"Right now, we have people under rubble, the targeting is ongoing, warplanes on residential neighbourhoods."
Insurgent shelling of government-held Damascus killed three people, the Observatory and Syrian state media reported.
Air strikes also killed at least six people in rebel-held Idlib including five in the village of Tarmala, the Observatory said.
UN officials in Syria called for hostilities to cease to enable humanitarian aid deliveries and the evacuation of the sick and wounded, listing seven areas of concern including northern Syria's Kurdish-led Afrin region, being targeted by a Turkish offensive.
Syrian President Bashar al-Assad, helped by Iranian-backed militias and the Russian air force, is pursuing military campaigns against insurgents in the last major pockets of territory held by his opponents in western Syria.
Ghouta and idlib
There were air strikes on towns across the Eastern Ghouta, including Douma, where an entire building was brought down, a local witness said.
The UN representatives noted that Eastern Ghouta had not received inter-agency aid since November.
"Meanwhile, fighting and retaliatory shelling from all parties are impacting civilians in this region and Damascus, causing scores of deaths and injuries," said their statement, released before the latest casualty tolls emerged on Tuesday.
They said civilians in Idlib were being forced to move repeatedly to escape fighting, noting that two pro-government villages in Idlib also continued to be besieged by rebels.
Syria's protracted war, which spiralled out of street protests against Assad's rule in 2011, will soon enter its eighth year, having killed hundreds of thousands of people and forced millions to leave the country as refugees.
Paulo Pinheiro, head of the International Commission of Inquiry on Syria, said the government siege of Eastern Ghouta featured "the international crimes of indiscriminate bombardment and deliberate starvation of the civilian population".
Reports of air strikes hitting at least three hospitals in the past 48 hours "make a mockery of so-called "de-escalation zones", Pinheiro said, referring to a Russian-led truce deal for rebel-held territory, which has failed to stop fighting there.
France's Foreign Ministry said it was concerned by the reports of chlorine being used on civilians in Syria, but that it was too soon to confirm them.
French President Emmanuel Macron last May that "any use of chemical weapons would result in reprisals and an immediate riposte, at least where France is concerned".
The conflict has been further complicated since January by a major offensive that neighbouring Turkey launched against the Kurdish YPG militia in Afrin.
The YPG has been an important US ally in the war against Islamic State militants, but Ankara sees it as an extension of the Kurdistan Workers Party (PKK), which is listed as a terrorist group by Turkey, the European Union and Washington.
Turkish President Tayyip Erdogan ramped up his verbal assault on the US role in Syria on Tuesday, saying US forces should leave Manbij, a Syrian city held by YPG-allied forces with support from a US-led anti-Islamic State coalition.
"If the United States says it is sending 5,000 trucks and 2,000 cargo planes of weapons for the fight against Daesh (Islamic State), we don't believe this," Erdogan told members of his AK Party in parliament.
"It means you have calculations against Turkey and Iran, and maybe Russia."
In agreement with Iran and Russia, the Turkish military is setting up observation posts in parts of Idlib and Aleppo province.
But militants firing rockets and mortars killed one soldier on Monday as Turkish forces moved to set up such a post south of Aleppo, near the front line between rebels and pro-Syrian government forces, the military said.
It was the second attack on the soldiers in a week.
In an apparent warning to Ankara, a commander in the military alliance supporting Assad said the Syrian army had deployed new air defences and anti-aircraft missiles to front lines with rebels in the Aleppo and Idlib areas.
"They cover the air space of the Syrian north," the commander told Reuters. That would include the Afrin area where Turkish warplanes have been supporting the ground offensive by the Turkish army and allied Free Syrian Army factions.
Last updated: February 06 2018 05:49 PM
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