Syria’s interim government has announced the end of a days-long military operation against insurgents loyal to ousted president Bashar Assad and his family in the worst fighting since the end of the 13-year civil war in December.

The days-long conflict has been among Syria's deadliest in a decade. Nearly 1,000 civilians have been killed, including women and children, according to the Syrian Observatory for Human Rights.

The announcement comes as the fighting between pro-Assad militias and members of the security forces killed more than 1,000 people, majority of whom are civilians, amid reports of rights violations.