Human Rights Watch says the Syrian military is firing ballistic missiles into populated areas where it is battling rebels, killing hundreds of civilians.

According to The Associated Press, the U.S.-based group said in a report released Monday, Aug 5 that it has investigated nine apparent missile attacks that killed at least 215 people, half of them children, between February and July.

HRW activists visited seven sites of the nine attacks. There were no apparent military targets near the inspected sites, the group said in a statement, calling on President Bashar Assad “to stop indiscriminate attacks.”