U.S.-led coalition airstrikes killed at least 19 people in Raqqa province, the Syrian Observatory for Human Rights said Sunday.
The strikes hit a school that was used as a shelter for displaced families in Al-Kesrat village south of the Islamic State's (ISIS) de facto capital.
Amaq news agency said that 15 more people were wounded in the strikes supporting the U.S.-backed Syria Democratic Forces.
Last week, 20 people, including children, were killed in the coalition's airstrikes in Raqqa.
Meanwhile, the Kurdish-led SDF gained new ground in Raqqa province after capturing Al-Ya'rubiya village.
Washington's support for the SDF, which launched a campaign to encircle Raqqa in November, has caused tension with NATO ally Turkey, which views the Kurdish militia as an extension of militants fighting on its own soil.
This article was edited by The Syrian Observer. Responsibility for the information and views set out in this article lies entirely with the author.