The Port Said Criminal Court on Sunday acquitted former Port Said security chief Salah Eddin Ahmed and three officers of killing three protesters and attempting to kill another 24 during the 25 January revolution.
The prosecution had called for imposing the harshest penalty on the suspects in the previous session.
Officers Hazem Abdel Fattah, Moataz Bellah al-Gohary, Mostafa al-Habashy and Ahmed Abdel Fattah were accused of shooting at protesters from the roof of the police station on 28 January 2011.
More than 800 protesters were killed during the January 2011 uprising that forced former President Hosni Mubarak to step down, many of whom were shot in front of police stations.
Courts this year have acquitted other police officers from various provinces on similar charges.
Edited translation from Al-Masry Al-Youm