May 26 (UPI) -- The Syrian Observatory for Human Rights said at least 106 family members of the Islamic State, including 42 children, were killed in airstrikes carried out by the U.S.-led international coalition.
The SOHR said one round of airstrikes began late Thursday and another began at about 1:30 a.m. on Friday in the city of al-Mayadin in the Deir ez-Zor province.
The British-based monitoring group said the coalition destroyed a municipal building in the city, adding that sources in the city said the airstrikes killed family members of militants of the Islamic State, also known as ISIS, ISIL and Daesh. The SOHR said the death toll is expected to increase as many people remain missing under the rubble of destruction.
The anti-Islamic State coalition led by the United States also targeted an electricity company and a blood bank, though the SOHR said it was not clear how many casualties resulted from those airstrikes.
At least 10 Islamic State militants died in the airstrikes, the SOHR said. Most victims were children and women of Syrian and Moroccan nationalities who were displaced from the city of Raqqa and from other areas in Deir ez-Zor held by the Islamic State.
U.S. Central Command on Friday said the coalition carried out five airstrikes in Deir ez-Zor that "destroyed seven ISIS oil trucks, four ISIS barges, an ISIS well head, a command and control node, and an ISIS headquarters."
The U.S. Department of Defense has not yet commented on the circumstances surrounding the airstrikes and the reported deaths of civilians.