Another activist group, the Aleppo Media Network, confirmed Saturday's airstrikes and posted a video of what it says was the aftermath of the al-Bab raid. Plumes of smoke rose from twisted metal and chunks of broken-up concrete strewn on the ground in the video.
The video appeared authentic and was consistent with The Associated Press' reporting of the airstrikes.
Meanwhile, fighters from al-Qaida-linked Jabhat al-Nusra ousted government troops from the al-Omar field Saturday during an overnight battle, Abdurrahman said. Syrian state media and officials did not mention it.
It is not clear if the field is operational. Before the uprising began in early 2011, the oil revenues provided around a quarter of the government's budget. In 2010, Syria produced about 380,000 barrels a day.
Oil exports have ground to nearly a standstill since. Assad's government now imports refined fuel supplies to keep up with demand amid shortages and rising prices.
In late 2012, rebels began seizing oil fields in Deir el-Zour, one of two main centers of oil production. In February, they captured the large Jbeysa oil field after three days of fighting. A year ago, rebels briefly captured al-Omar field only to lose it to government troops days later.
Rebels largely have been unable to benefit from the oil fields. The country's two refineries remain under government control and the threat of airstrikes make working the fields difficult.
Rebels fired mortar rounds Saturday at the oil refinery in the central city of Homs, setting ablaze a tank carrying thousands of liters (gallons) of fuel, a local official in the city told the AP. Firefighters fought to control the blaze, which threatened to spread to a larger tank nearby, the official said. He spoke on condition of anonymity in line with regulations.
In the predominantly Kurdish northeastern town of Qamishli, a car bomb exploded at a local police station, killing two, the Observatory said. The bombing comes as Kurdish fighters battle jihadis in predominantly Kurdish areas of northern Syria.
In the Damascus' eastern Ghouta suburb, the Observatory said fierce fighting overnight with government forces killed 25 rebels including six local commanders. It added that many soldiers were killed in the battles. There was no mention of the fighting in official Syrian media.
Also Saturday, a pro-government television station said gunmen fired at a vehicle belonging to a Syrian Cabinet minister, killing his driver. Al-Ekhbariya said Minister Ali Haider was not in the car when it came under fire while traveling on a highway that links the central city of Hama with Tartous on the Mediterranean coast. A government media office confirmed the report.
Syria's civil war started as a peaceful uprising against Assad that deteriorated into all-out civil war after a government forces violently cracked down on protesters. The conflict has killed some 120,000 people, activists say. The United Nations said in July that 100,000 Syrians have been killed, and has not updated that figure since. Millions of Syrians have been uprooted from their homes because of the fighting.
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Associated Press writers Diaa Hadid in Beirut and Albert Aji in Damascus, Syria, contributed to this report.
