However, there were also claims that one bomb accidentally hit a column of Hashed al-Sha'abi paramilitaries – the Popular Mobilisation Units, as the umbrella group for locally raised, mostly Shia militias is formally known.
Isil's startling victories in Ramadi, after an 18-month battle for control, and Palmyra in neighbouring Syria, after a lightning advance, have sent shock waves through both countries and the Washington political and military establishment.
Isil have released photos of their black flag flying over the 13th century Palmyra Castle in Syria
In Syria, monitors estimated that Isil now control half of the country's entire land mass – though much of its territory is desert.
Following its capture of Palmyra, with its historic ruins, Isil chased regime troops west down the road to Homs, as well as hunting pro-regime fighters and soldiers hiding in the city itself. Up to 280 were killed on Thursday and Friday, according to media activists in the city, with the bodies of 150 left in the streets as a warning.
Isil also seized nearby gas fields.
The regime is also reeling from the loss of territory to non-Isil but often hardline Islamist rebels in the north-west and south.
An image allegedly showing a damaged Syrian military helicopters at Palmyra air base after it was captured by Isil militants
In Jisr al-Shugur, a town in Idlib, a rebel group led partly by Jabhat al-Nusra, the local al-Qaeda affiliate which split from Isil took the hospital that was the last holdout of regime troops.
Photographs captured the regime soldiers who had been surrounded for weeks making a run for it. Syrian state media said they had been "liberated" but Jabhat al-Nusra said many were shot as they fled.
In Iraq, President Barack Obama has insisted that he will continue to rely on the Iraqi Security Forces regrouping and defeating Isil, though he accepted in an interview on Thursday that it would take "years".
Three Isil fighters pose in Ramadi after the Iraqi army 'abandoned' the city
However, if Isil manages to consolidate its hold on Anbar, it will have a unified hold of a large Sunni area covering half of Syria and a large part of Iraq, stretching to a few miles from the Baghdad security perimeter.
The conventional wisdom is that it will not try to launch a direct assault on the city, now largely Shia, but it will be able to launch suicide bombings and other attacks with virtual impunity.
Its success will also discourage Sunnis fighters, many of whom have up to now stayed loyal to Baghdad despite a dislike of its Shia-led government, from fighting Isil – the very tactic on which the West's strategy of "no boots on the ground" intervention depends.
Habbaniyah: Colonial past of battleground
By a quirk of history, the airbase where the Iraqi Security Forces and allied Shia militia are gathering prior to attempts to retake the city of Ramadi from Isil is the birthplace of scores of British and Commonwealth citizens.
The Habbaniyah base east of Ramadi began life as RAF Dhibban, and dates from the time when Britain was the unwelcome colonial power in the country. Opened in 1936, and unofficially called “Second London”, it acquired its current name in 1938, and remained a major British base until troops were withdrawn following the coup that overthrew the British-backed monarchy 20 years later. Photographs show a neat settlement with lawns and drives, its own school, racecourse and even its own fox hunt.