Cairo (CNN) -- Hundreds of people were caught up early Saturday in a standoff between Islamist supporters of deposed President Mohamed Morsy and the Egyptian military at a mosque-turned-makeshift morgue, raising fears of a widening violence that will further push the country into chaos. The Al-Fateh mosque near Ramses Square in central Cairo has become the latest flashpoint in the growing crisis after more than 1,000 people reportedly sought refuge following Friday's clashes between protesters primarily aligned with the Muslim Brotherhood and security forces. Protesters took those killed and wounded in the clashes at the Ramses Square to the mosque, where the Muslim Brotherhood established a makeshift field hospital.
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NEW: More than 1,000 people are caught up in a standoff at a Cairo mosque, officials say
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NEW: State TV reports 821 Muslim Brotherhood members arrested
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Conflicting casualty figures put the death toll in Cairo between 17 and 54
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Roving armed groups are sporadically clashing in Cairo, state media reports
The casualties have not been limited to @placeholder supporters and security forces.