"It's really violent", said Tareq Abdelhaq, an activist.
More than 350 people - including 86 children and 68 women - have been killed in bombardments in Eastern Ghouta alone since December 29, SOHR says.
It released a video showing its workers rushing to rescue victims from underneath the rubble Tuesday.
Accusing the Syrian regime of using the gas to "terrorize innocent civilians", US State Department spokesperson Heather Nauert noted in a Monday statement that this attack is the sixth such reported instance in the past 30 days in Syria.
Eastern Ghouta and Idlib, a northern province where violence also flared this week, are both so-called de-escalation zones under a deal previous year meant to pave the way towards an end to the conflict.
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"For the last two months, we have not had a single (aid-delivery) convoy".
The last Armenian in Afrin noted that Afrin was one of the few regions of Syria that had avoided war.
The White Helmets said airstrikes targeting the village of Termala in Idlib on Tuesday killed three people.
"Currently, the main tasks of the Russian forces in Syria are the monitoring of the ceasefire in the de-escalation zones and assisting the Syrian people in returning to a peaceful existence", Konashenkov said.
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According to a statement by the Turkish General Staff, the operation aims to establish security and stability along Turkey's borders and the region as well as to protect Syrians from terrorist oppression and cruelty.
The deadliest raids on Monday hit a market in the town of Beit Sawa, killing 10 civilians including two children.
Rouhani told Putin that Iran "is opposed to the presence of foreign forces on Syrian soil without the permission of the country's government and nation", in a reference to the ongoing Turkish assault on Kurdish forces in Syria. We were expelled from our homes in Turkey and arrived here. They have taken refuge in the north of the province in one of the biggest displacements of the war so far, Moumtzis said. After a shootout with the attackers on the ground, Filipov blew up himself with a hand grenade. It was the first time a Russian jet was shot down over Syria since Russia launched its air campaign on Assad's behalf.
A Twitter account affiliated with Turkey's so-called Operation Olive Branch in Syria claimed Tuesday that forces affiliated with the Democratic Union Party-a leading Syrian Kurdish political party that commands the armed and USA -backed People's Protection Units (YPG)-fired a mortar shell containing toxic chlorine gas at Turkey-backed Free Syrian Army (FSA) insurgents in northern Afrin, injuring up to 20.
North American stocks plunge, loonie closes at 79.46 cents US
Snapchat owner Snap soared 20.6 percent after it reported surging growth in users and revenue in its latest quarter. Gold fell $7, or 0.5 percent, to $1,329.50 an ounce and silver dipped 9 cents, or 0.5 percent, to $16.58 an ounce.
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