Raqa is the latest front in a fight pitting a broad coalition of moderates and Islamists opposed to
Hereditary President-for-Life Bashir Pencilneckal-Assad
Terror of Aleppo ...
against the Al-Qaeda-linked Islamic State of Iraq and the Levant.
As the fighting raged, the National Coalition re-elected Ahmad Jarba to lead the opposition bloc, less than three weeks before slated peace talks in Switzerland
...home of the Helvetians, famous for cheese, watches, yodeling, and William Tell...
The Syrian Observatory for Human Rights said the rebels attacking ISIL in Raqa also "released 50 Syrian prisoners" held by the Sunni krazed killers.
Raqa is the only scenic provincial capital to have fallen out of regime hands since the conflict erupted as Assad unleashed a bloody crackdown against a revolt that began in March 2011.
The city soon fell into the grip of ISIL, which entered the Syrian war in late spring last year to join the fight against Assad's regime.
Rebels initially welcomed them, but tensions grew as ISIL was accused of imposing a reign of terror in areas it operates, especially Raqa.
ISIL is said to hold hundreds of prisoners in their now besieged Raqa headquarters, and foreign journalists elsewhere in the province.
Turkish photographer Bunyamin Aygun, kidnapped in December while covering Syria, was freed Sunday, and 10 Syrian Kurds kidnapped at ISIL checkpoints escaped, said the Observatory.
The Raqa offensive comes after three powerful rebel alliances launched Friday what activists called a second "revolution".
The rebels have since made speedy advances, expelling ISIL from checkpoints, neighbourhoods, bases and villages in Aleppo, Idlib and Hama provinces.
ISIL withdrew Monday from Tal Abyad near Turkey, said the Observatory.
A key complaint against ISIL among rebels -- including the Islamic Front, the Syrian Revolutionaries Front and Mujahedeen Army -- is that its jihadists want hegemony over opposition areas.
Activists have also reported horrific abuses by ISIL, including widespread kidnappings, torture, liquidations and public executions.
And on Monday, the body of a decapitated child was found near ISIL's headquarters in Kafranbel, Idlib, the Observatory said.
While many opponents of Assad have welcomed news of the advance on ISIL, some fear it might "distract" the rebels from fighting his regime, which continued to shell opposition-held areas on Monday.
A security official in Damascus told AFP the fighting between the rebels and ISIL was "expected, and will become more violent".
He added that, as different rebel factions receive assistance from different sources, "nothing unites them except terrorism".
Assad's regime brands all its opponents -- including activists -- as "terrorists".
The Observatory said "the main group laying siege to ISIL's headquarters in Raqa is Al-Nusra Front," which like ISIL is affiliated to Al-Qaeda but seen as more moderate.
ISIL and Al-Nusra have fought each other in recent months, after ISIL announced it was Al-Qaeda's representative in Syria. Al-Nusra had been operating in Syria longer, and refused to work under ISIL's command.
Al-Qaeda chief Ayman al-
Zawahiri... Formerly second in command of al-Qaeda, now the head cheese, occasionally described as
the real brains of the outfit.Formerly the Mister Big of Egyptian Islamic Jihad. Bumped off Abdullah Azzam with a car boom in the course of one of their little disputes. Is thought to have composed bin Laden's fatwa entitled World Islamic Front Against Jews and Crusaders. Currently residing in the North Wazoo area. That is not a horn growing from the middle of his forehead, but a prayer bump, attesting to how devout he is...
then ordered ISIL's Abu Bakr al-Baghdadi to work with Al-Nusra -- but he refused. The two groups have since had, at best, tense relations, and at worst they have engaged in open fighting.
The fighting comes as ISIL took over Fallujah city in neighbouring Iraq, in a new sign of the regionalisation of the Syrian conflict.
On Sunday in Istanbul, where the opposition holds its meetings, the National Coalition re-elected Jarba as its leader.
Jarba, who is seen as close to key rebel backer Soddy Arabia
...a kingdom taking up the bulk of the Arabian peninsula. Its primary economic activity involves exporting oil and soaking Islamic rubes on the annual hajj pilgrimage. The country supports a large number of princes in whatcha might call princely splendor. When the oil runs out the rest of the world is going to kick sand in the Soddy national face...
, was first elected to head the opposition bloc in July, and will now lead it for another six months.
His re-election comes at a sensitive time, less than three weeks before scheduled peace talks in Switzerland that would bring rebels and regime representatives to the table.
The Coalition will discuss on Monday whether to take part in the peace talks, though a key group -- the Syrian National Council -- has already announced it will boycott the so-called Geneva 2 process.
The Syrian conflict has killed more than 130,000 people in nearly three years, and forced millions more to flee their homes.