The Britain-based Syrian Observatory for Human Rights said 15 blasts shook the northern and eastern outskirts of Raqqa today, killing 32 IS fighters and wounding more than 40.
A Raqqa-based activist group that reports on IS, known as Raqqa is Being Slaughtered Silently, said warplanes struck IS positions on the edge of the city. It had no word on casualties.
RBSS did not say which country carried out the airstrikes while the Observatory said they are believed to be from the U.S.-led coalition that began targeting IS in Syria in September 2014.
Russia and a U.S.-led coalition that includes France have been pounding Raqqa.
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The U.S. Treasury Department sanctioned four individuals and six entities for providing support to the Syrian government. As a result, the U.S.-based assets of those individuals and entities are frozen, and Americans are generally prohibited from engaging in transactions with them.
George Haswani, co-owner of HESCO Engineering and Construction Co., a major engineering and construction company in Syria, told The Associated Press in Damascus that the accusations are not true "simply because the oil pipeline is out of service and is damaged in more than 60 points."
Earlier this year, the European Union imposed sanctions on Haswani, also accusing him of helping the Syrian government buy oil from the Islamic State group.