A Cairo court on Thursday found two policemen not guilty of killing five demonstrators or attempting to murder seven others on January 28, 2011, known as "Friday of Rage".
Their acquittal was based on eyewitnesses who denied that the defendants were at the crime scene, reported the Middle East News Agency.
"Friday of Rage" is considered a turning point in Hosni Mubarak's rule as hundreds of thousands took to the streets to demand the fall of the regime.
Many of the victims of last year's uprising were killed on the day.
Most policemen accused of killing protesters during the uprising where over 800 people were killed have been acquitted by courts due to lack of evidence.