According to a security source in Damascus, rebels have taken control of three army and police posts in Sweida, and most of Deraa is no longer in the hands of the regime.
Rebel forces pressing a lightning offensive in Syria aim to overthrow President Bashar al-Assad's rule, their Islamist leader said in an interview published on Friday.
The Islamist-led rebels were also at the gates of Syria's Homs, Syrian Observatory for Human Rights (SOHR) war monitor said, after wresting other key cities from government control.
In little over a week, the offensive has seen Syria's second city Aleppo and strategically located Hama fall from President Bashar al-Assad's control for the first time since the civil war began in 2011.
Regime leaves Deir Ezzor, clashes around Daraa
Meanwhile, Syrian troops and their Iran-backed allies "suddenly" pulled out of eastern Deir Ezzor city and its surroundings Friday, including Al Bukamal and Al Mayadeen sectors.
"Syrian regime forces and commanders of Iran-backed allied groups suddenly withdrew from Deir Ezzor city and its countryside with columns of soldiers heading towards central Syria," Rami Abdel Rahman, who heads the SOHR, told AFP.
Shortly after they left, the Syrian Democratic Forces (SDF), a Kurdish-dominated coalition controlling the east of the country with Western backing, began to take over the positions left abandoned.
Should the rebels capture Homs, that would cut the seat of power in the capital Damascus from the Mediterranean coast, a key bastion of the Assad clan, which has ruled Syria for the past five decades.
In Syria's southern Daraa province, the Observatory said local fighters took control of at least two checkpoints after government forces pulled out, and also seized a police station and an air force intelligence branch elsewhere.
In Nawa, north of Daraa city, the Observatory said "local fighters managed to control several positions" including some administrative buildings "after a broad attack targeting the military intelligence department".
"In retaliation, regime forces... shelled residential areas in Nawa with artillery," the monitor said, adding that the shelling extended to other towns.
A local activist told AFP, requesting anonymity, that local armed groups were gathering together and would announce a "joint operation", without elaborating on what it would entail.
According to the Syrian Observatory for Human Rights (SOHR), rebels have attacked several government positions in Sweida, notably taking control of the central prison and the headquarters of the Baath Party. They also control several checkpoints and military positions within the city. The SOHR also reports that officials and security chiefs have evacuated government offices in Sweida.
In response, the Israeli military said it was "reinforcing aerial and ground forces" in the occupied Golan Heights in response to sweeping Islamist-led rebel advances in Syria.
In a statement, the military said it was "monitoring developments and is prepared for all scenarios, offensive and defensive alike", adding that it "will not tolerate any threat near the Israeli border".
Near the coastal area, HTS-linked elements attacked Syrian army positions in the direction of Latakia, while Russian airstrikes attempted to counter their advance, according to the Liveuamap news website.
Rebels at Homs gates
After wresting other key cities from government control, the Islamist-led rebels were at the gates of Syria's Homs, a war monitor said, though the defense ministry denied claims it had withdrawn its troops.
The rebel alliance conducting the offensive that began on November 27 is led by HTS, which is rooted in the Syrian branch of Al-Qaeda.
The rebels launched their offensive in northern Syria the same day a ceasefire took effect in the war between Israel and Lebanese group Hezbollah, which along with Russia and Iran have been crucial backers of Assad's government.
Jordan closed its borders
According to the SOHR, the Syrian opposition took control of the Nassib border crossing with Jordan. In response, Jordan closed its borders with Syria.
Jordan's interior minister Mazen al-Faraya announced "the closure of the Jaber border crossing opposite the Syrian Nassib crossing as a result of the surrounding security conditions in Syria's south".
Fear
Fearing the rebels' advance, tens of thousands of members of Assad's Alawite minority were fleeing Homs on Thursday, residents and the Observatory said.
Khaled, who lives on the city's outskirts, told AFP that "the road leading to (coastal) Tartus province was glowing... due to the lights of hundreds of cars on their way out".
Homs was the scene of a months-long government siege of opposition areas and deadly sectarian attacks in the early years of the civil war.
Early in the war, which began with Assad's brutal crackdown on democracy protests, activists referred to the city as "the capital of the revolution" against the government.
Syrians who were forced out of the country by the crackdown on the revolt were glued to their phones as they watched the developments unfold.
"We've been dreaming of this for more than a decade," said Yazan, a 39-year-old former activist who survived the siege and is now living as a refugee in France.
Asked whether he was worried about HTS's Islamist agenda, he said: "It doesn't matter to me who is conducting this. The devil himself could be behind it. What people care about is who is going to liberate the country."
On the other side of the sectarian divide, however, there was fear among Homs's Alawite community.
Haidar, 37, who lives in an Alawite-majority neighbourhood, told AFP by telephone that "fear is the umbrella that covers Homs now".
"I've never seen this scene in my life. We are extremely afraid, we don't know what is happening."
On Friday, the rebel alliance "entered the cities of Rastan and Talbisseh" on the main road between Hama and Homs, the Observatory said.
The factions were faced with "a total absence" of government forces, it added.
Footage posted on social media and verified by AFP showed rebels firing into the air as they drove through Talbisseh.
The Syrian defense ministry said the army launched strikes against "terrorist" fighters in Hama province.
The Syrian Observatory, which relies on a network of sources in Syria, said 826 people, mostly combatants but also including 111 civilians, have been killed since the offensive began last week.
The United Nations said that the violence has displaced 280,000 people, warning that numbers could swell to 1.5 million.
Observatory head Rami Abdel Rahman said there was a "massive exodus of Syrian Alawites from parts of Homs, tens of thousands are heading towards the Syrian coast, fearing the rebels' advance".
'Massive blow'
Many of the scenes witnessed in recent days would have been unimaginable earlier in the war.
The rebels announced on Telegram their capture of Hama following street battles with government forces, describing it as "the complete liberation of the city".
Many residents turned out to welcome the rebel fighters. An AFP photographer saw some residents set fire to a giant poster of Assad on the facade of city hall.
The army admitted losing control of the city, though Defense Minister Ali Abbas insisted that its withdrawal was a "temporary tactical measure".
In a video posted online, HTS leader Jolani said his fighters had entered Hama to "cleanse the wound that has endured in Syria for 40 years", referring to an army massacre in the 1980s.
In another message on Telegram congratulating "the people of Hama on their victory," he used his real name, Ahmed al-Sharaa, instead of his nom de guerre for the first time.
Aron Lund, a fellow of the Century International think tank, called the loss of Hama "a massive, massive blow to the Syrian government".
Should Assad lose Homs, it wouldn't mean the end of his rule, Lund said, but "with no secure route from Damascus to the coast, I'd say it's over as a credible state entity."
UN chief Antonio Guterres said Thursday that the escalation in Syria is the result of a "chronic collective failure" of diplomacy.
Layal Abou Rahal, with AFP
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