Egypt's human rights agency says at least 2,600 people lost their lives in violence related to the ouster of the country's former president, Mohamed Morsi, in 2013, Press TV reported.
The head of Egypt's National Council for Human Rights, Mohammed Fayeq, said on Sunday that the victims, nearly half of them supporters of Morsi, were killed between June 30, 2013 and December 31, 2014.
At least 600 supporters of Morsi were killed on August 14, 2013 alone, during a sit-in protest in the capital, Cairo.
According to the state rights agency, hundreds of police officers were also killed in the deadly clashes following Morsi's ouster.
Fayeq slammed Egyptian authorities for detaining suspects for an extended time period, pending the filing of formal charges and trial as "punishment for crimes not committed."
He added that police stations were filled 400 percent above their capacity.
The agency's head also voiced concern at the rising number of deaths in prison.
Morsi was ousted in a military coup on July 4, 2013 by then army chief and current President Abdel Fattah el-Sisi.
The country's first democratically-elected president, Morsi, was toppled only one year after he took office with the backing of Egypt's Muslim Brotherhood movement.
Sisi has been cracking down on any opposition since Morsi's ouster, banning the Muslim Brotherhood movement, from which Morsi rose to power, and arresting thousands of its members and supporters.
Nearly the entire leadership of the group and thousands of its members and supporters are currently in prison.