February 9, 2015 2:16 PM EST

At least 15 people were killed in airstrikes Monday on the rebel stronghold of Douma, a suburb of Damascus, according to a monitoring group.

Douma, a bastion for rebels fighting the regime of President Bashar Assad, has recently been rocked by government bombardments as Damascus increasingly resorts to airstrikes. On Friday, at least 82 people—including eighteen children—were killed in air force strikes on Douma after rebels fired rockets into the center of the capital, killing 10 people.

After those attacks, Syria’s state news agency SANA said the army had “eliminated scores of terrorists,” Reuters reported.

The death toll from the strikes on Monday was likely to rise because of the number of serious injuries, according to the Syrian Observatory for Human Rights, which monitors the war in Syria.

The United Nations says that at least 200,000 thousand people have been killed and nearly 4 million people have fled the country since fighting began in 2011.

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