Constitution Party founder Mohamed ElBaradei has called for the perpetrators of the Maspero clashes, which took place one year ago today, to face justice.

"A revolution that doesn't put those who kill its own children on trial is an incomplete revolution," ElBaradei said via Twitter.

Tuesday marks the first anniversary of the clashes that left 27 people dead, mostly Coptic Christians, when a peaceful protest was confronted by the army near the state radio and television building at Maspero in central Cairo.

To commemorate the massacre a number of protests are set to take place, with the biggest one leaving Dawran Shubra Square at 4pm and leading to the Maspero building.