While Sisi did not specifically name any political faction, his words were seen as an attempt to seek public backing for a decisive move against supporters of Morsi, who have promised to stage street protests until he is returned to power. The former President is in detention with a number of other leading figures in his Muslim Brotherhood movement.
A statement from the Brotherhood said that Sisi's comments were "an announcement of civil war". Dr Wael Haddara, a senior Morsi aide who is visiting London this week, described the demonstration as a "mob action" that was likely to encourage the very kind of state-sponsored violence it purported to wish to avoid. "The expectation is that the protesters will be painted as terrorists, with all stops then pulled out to get rid of them, on the pretext of ridding the country of terrorism."
Haddara was due to speak at a meeting in the House of Lords, where he would outline the Brotherhood's concern at the West's ambiguous attitude to Morsi's overthrow. The Brotherhood says that Britain and the US were far too muted in their condemnation of the coup, which they point out removed a democratically elected government.
They argue that had the army removed a secular government at Islamists' behest, rather than the other way around, the criticism in the West would have been far greater.