The Muslim Brotherhood's Freedom and Justice Party (FJP) has called for an uprising against those who want to "destroy Egypt's revolution."
"The Freedom and Justice Party calls on the great Egyptian people to rise up against those who want to steal their revolution with tanks and armoured vehicles, even over the dead bodies of the people," it said in a statement.
The FJP also condemned the "massacre" of pro-Morsi protesters on Monday morning.
The army and police clashed with pro-Morsi protesters at the Republican Guard headquarters in Cairo’s Nasr City during dawn prayers on Monday, leaving 42 dead and 322 injured.
The FJP said: "The Egyptian people woke up on 8 July 2013 to the sound of bullets being fired at peaceful protesters in front of the Republican Guard HQ while they were performing their dawn prayers, turning it into a horrible massacre."
In an official statement published by Al-Ahram Arabic news website, the army said an "armed terrorist group" attempted to break into the Republican Guard headquarters in the early hours of Monday and "attacked security forces."
One officer died and 40 soldiers were injured, including seven in critical condition, the army statement reads.
"This has never happened before in the history of the Egyptian army," the FJP statement added. "Perhaps there are still some wise men in the army who can put a stop to this behaviour, which is abnormal from the Egyptian army."
The FJP also called on the international community to step in to stop further bloodshed and prevent Egypt becoming like Syria.