The United Nations’ top human rights official says the death toll from six months of unrest in Syria has reached at least 2,600.

U.N. High Commissioner for Human Rights Navi Pillay says the figure is based on “reliable sources on the ground.”

Ms. Pillay spoke on Monday at the opening of a three-week meeting of the U.N. Human Rights Council in Geneva.

The council last month held an urgent meeting on Syria at which it voted overwhelmingly to demand that Syria end its bloody crackdown against anti-government protesters.