In the latest incident, state-owned Al-Ahram newspaper reported on its website that two men were shot dead when assailants attacked a sit-in by the deposed Islamist's loyalists near Cairo University early Tuesday.

A hospital official confirmed that two bodies were received early Tuesday morning.

The morning violence came after Morsi's supporters battled his opponents with stones and birdshot near Cairo's Tahrir Square the previous evening, leaving one person dead.

Another three people died Monday night in violence in Qalyub, north of Cairo, one of them hit by a train as he tried to escape the clashes.

Morsi's Muslim Brotherhood said a loyalist was killed in northern Cairo, when police clashed with pro-Morsi protesters. The death could immediately be verified.

The latest bloodshed came as Morsi's family said they planned to sue the military for having "kidnapped" the elected president, who has been in custody since a July 3 coup.