Abu Al-Baraa Al-Hamawi, a rebel leader in northern Hama, said about 95 percent of people had left a number of villages in northern and western Hama province and in southern Idlib province in the last three days due to intensive air strikes.
Syrian forces, backed by Russian Federation and Iran, have been massing for weeks around Idlib's borders where the last bastion of Islamist-dominated rebel groups is seeking refuge and the final obstacle for Assad to declare victory.
About 2.9 million people live in the opposition-held area, which comprises most of Idlib province and adjacent small parts of Latakia, Hama and Aleppo provinces.
Then in April 2018 the US, France and Britain launched a joint attack on Syrian facilities after a chemical strike on the city of Douman was reported to have killed at least 70 people.
The raids prompted hundreds of families to take to the roads, as dozens of cars and trucks tried to ferry civilians away from the bombardment.
The raids targeted jihadist and rebel positions, some of which were empty and others in use, Observatory head Rami Abdel Rahman said.
Idlib is mostly controlled by Hayat Tahrir al-Sham (HTS) - an alliance spearheaded by powerful jihadists once linked to Al-Qaeda.
On Saturday, the United States' top general said he and Trump have "routine dialogue" about possible military consequences if the Syrian regime uses chemical weapons in Idlib.
And perhaps more alarming is that the report details that Trump is undecided over whether new retaliatory strikes could entail expanding the attack to hit Assad allies Russian Federation and Iran this time around.
President Bashar Assad's regime has upped its rhetoric on retaking control of Idlib and surrounding areas over the past month.
Russian Federation has said it wants all militants to be pushed out of Idlib and that it avoids civilians and targets only radical Al-Qaeda-inspired groups.
The Pentagon is crafting military options, but Mr. Trump hasn't decided what exactly would trigger a military response or whether the U.S. would target Russian or Iranian military forces aiding Mr. Assad in Syria, U.S. officials said.
Assad has reportedly given the green light to deploy chlorine gas as his military continues to bombard the northwestern province in a bid deal a winning blow in the country's seven-year civil war.
"When they did not comply, the shooting started on the vehicle", Abdel Rahman said.
The town is run by Kurdish-led administrators and forces, but Syrian government troops hold pockets of territory there, including the airport.
That's right, unnamed United States officials are now claiming to be in possession of intelligence which they say shows Assad has already given the order in an absolutely unprecedented level of "pre-crime" telegraphing of events on the battlefield. But in recent days, the Damascus government announced that it will be holding local administration elections, including in Kurdish-ruled areas, undermining the negotiations with the Kurds and their proposal for self-rule.