Judicial officials said on Wednesday that the court jailed 15 defendants for life in prison while three of them received 15-year terms and the rest of the defendants were sentenced to 10 years behind bars.
The unnamed sources added that the defendants were convicted of killing three civilians during a protest near state television headquarters in Cairo on July 5, 2013, Presstv reported.
The defendants were also charged with "carrying weapons and attacking state institutions" during the demonstration.
In July 2013, Egypt’s first democratically-elected president, Mohamed Morsi, was ousted by the military under the leadership of Abdel-Fattah el-Sisi, the country's current president.
On August 14, 2013, Egyptian security forces raided two camps of pro-Morsi protesters in Cairo: One at the al-Nahda Square and another larger one at the Rabaa al-Adawiya Square.
According to the Egyptian Health Ministry, the attacks claimed the lives of 638 people, 595 of whom were civilians, and injured at least 3,994 others.
Following the military ouster of Morsi, thousands of his supporters and also proponents of the Muslim Brotherhood movement, which was later outlawed by the government, have been jailed, with many of them, including Morsi himself, receiving death penalties in mass trials.