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The killings of at least 817 people by Egyptian security forces last year probably amount to a crime against humanity, Human Rights Watch says
A report by the US-based group says 1,000 or more people probably died in one day around Rabaa al-Adawiya mosque.
The deaths came during demonstrations broken up by Egyptian security forces.
Executive director Kenneth Roth said the deaths were "one of the world's largest killings of demonstrators in a single day in recent history".
Mr Roth and a colleague were stopped from entering Egypt on Monday.
They were due to launch the new report at a press conference in the Egyptian capital, but were deported after being held for 12 hours at Cairo International Airport.
The group's year-long investigation focused on six demonstrations in July and August 2013 that were forcefully broken up by security forces, then under the command of now-President Abdul Fattah al-Sisi.
Mr Sisi, who was then a general running Egypt's military and was elected head of state in May 2014, oversaw the ousting of President Mohammed Morsi in July 2013.
In the aftermath his armed forces launched a brutal crackdown on Muslim Brotherhood supporters.
A report by the US-based group says 1,000 or more people probably died in one day around Rabaa al-Adawiya mosque.
The deaths came during demonstrations broken up by Egyptian security forces.
Executive director Kenneth Roth said the deaths were "one of the world's largest killings of demonstrators in a single day in recent history".
Mr Roth and a colleague were stopped from entering Egypt on Monday.
They were due to launch the new report at a press conference in the Egyptian capital, but were deported after being held for 12 hours at Cairo International Airport.
The group's year-long investigation focused on six demonstrations in July and August 2013 that were forcefully broken up by security forces, then under the command of now-President Abdul Fattah al-Sisi.
Mr Sisi, who was then a general running Egypt's military and was elected head of state in May 2014, oversaw the ousting of President Mohammed Morsi in July 2013.
In the aftermath his armed forces launched a brutal crackdown on Muslim Brotherhood supporters.