Human rights organizations have offered similar views. And U.N. Secretary-General Ban Ki-moon is among the world leaders who have called for Morsy and other detained leaders to be immediately released "or (to) have their cases reviewed transparently without delay."
This political standoff comes as Egypt deals with a long struggling economy and additional security challenges.
In the volatile region of Sinai, for instance, armed men attacked a military checkpoint and police station in the town of Sheikh Zweid, resident Ahmed Abu Eita said. At least one armored military vehicle was hit by a rocket-propelled grenade, he said.
"We can't leave home ... We don't know who is firing at who," Eita said. "The ambulances can't even move to get the injured."
He and others said the upheaval in Cairo has hurt efforts to fight terrorism and bring peace to his region, where violence has long been a problem and has increased since Morsy's ouster.
Egypt seemingly has been teetering for years, and there has been little indication of late those festering tensions will calm anytime soon.
Speaking on CNN, Muslim Brotherhood spokeswoman Mona al Qazzaz accused the military and opposition of, together, "killing the biggest democracy in the Middle East."
"The military stepped in, and the opposition that failed to win through the ballot boxes came on the back of the tanks," she said.
Yet opposition activists, such as June 30 Front spokesman Ahmed Hawary, said Morsy left the military little choice but to intervene. Yes, he was democratically elected, but he didn't give those opposed to him any way to check and challenge what he was doing, according to Hawary.
"Democracy is due political process," he told CNN. "But there has never been a due political process (under Morsy)."