It was not immediately clear whether the aircraft had carried out any bombing runs as there were heavy artillery exchanges on the ground.
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Fighting between a pro-government militia and Kurdish forces since Wednesday has left at least 43 people dead including 27 civilians, among them 11 children, according to the Observatory.
Dozens of civilians have been killed in the last 48 hours, he told Reuters.
Two-thirds of Hasaka are controlled by the Kurds and the rest by the regime of President Bashar Assad.
Cook said the U.S.’s warning to the Syrian regime not to fly where US forces are located in Syria was “not a no-fly zone”.
A Kurdish journalist who’s Heybar Othman, in Hassakeh, told the BBC that it was the very first time the Syrian government had used air power against town.
When the bombing began, coalition forces on the ground tried to call the Syrian aircraft on a common radio channel, but there was no response, according to Pentagon spokesman Captain Jeff Davis. A small number of U.S. Special Operations forces have been working in the Hasakah area for months training and advising Kurdish elements of the Syrian Democratic Forces for the fight against ISIS, but the Syrian regime has been targeting the same group as part of the larger civil war.
The US Defense Department said in a statement that coalition forces had been put at risk.
But the warning appeared to fall on deaf ears.
By the time the US and coalition aircraft arrived the Syrian attack jets had left.
The U.S. confirmed last week that it scrambled fighters after coalition forces came under attack by Syrian warplanes.
That prompted the US-led coalition to scramble aircraft, with Washington warning the Syrian government against strikes that might endanger its military advisers with the Kurds on the ground.
A Syrian military statement said the army had taken the “appropriate response” after Kurdish forces attacked Hasakeh.
When pressed, Cook said the warning also extended to jets from Russian Federation, which has been bombing in support of Assad since past year.
The Kurdish People’s Protection Units, or YPG, are a key U.S. ally in the fight against IS.
U.S., British, and French Special Operation troops have been advising local forces fighting in northern and eastern Syria since late a year ago.
It said two Buyan-class corvettes including its new Zelyony Dol patrol ship staged 3 launches of Kalibr missiles against targets linked to the former Al-Nusra Front group, which has renamed itself the Fateh al-Sham Front.
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Meanwhile, Russia has stopped using an Iranian air base for strikes in Syria, Iran’s foreign ministry announced yesterday, bringing an abrupt halt to an unprecedented deployment that was criticised both by the White House and some Iranian lawmakers. In Syria’s besieged city of Aleppo, more than 275,000 people have been cut off from food, water and medical supplies recently.
