This article originally appeared on CNN:

More than 90 people — including at least 11 children — have been executed by ISIS fighters in the central Syrian city of Palmyra in the last seven days, the head of the Syrian Observatory for Human Rights told CNN on Sunday.

Many of the people killed were family members of Syrian regime forces or policemen, said Rami Abdurrahman, the observatory’s executive director.

About 11,000 people have fled Palmyra and its surrounding villages after ISIS took control of the area, the U.N. Refugee Agency said last week.

Syrian State TV, citing local sources inside Palmyra, reported Sunday that 400 people have been killed in the city as fighting has raged.

ISIS has taken control of the city, and it is feared that the group may now destroy Palmyra’s ancient treasures.

Read the full story at CNN.