CAIRO - The killing of hundreds of Egyptian demonstrators at two protest camps last year was systematic, ordered by top officials and probably amounts to crimes against humanity, Human Rights Watch said on Tuesday, calling for a UN inquiry.

In a 188-page report based on a year-long investigation, the New York-based group urged the United Nations to look into six incidents involving killings by security forces of supporters of elected Islamist President Mohamed Morsi, who was overthrown by the army on July 3, 2013, following several days of protests.

Hundreds of supporters of Morsi's Muslim Brotherhood have been killed and thousands arrested since he was ousted, with the largest number of deaths taking place during the storming of two protest camps by security forces on August 14, 2013.

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