Egypt : More than 1,000 people are caught up in a standoff at a Cairo mosque , officials say . NEW : State TV reports 821 Muslim Brotherhood members killed . Conflicting casualty figures put the death toll in Cairo between 17 and 20 . Roving armed groups are sporadically clashing in Cairo , state media reports .
NEW : More than 1,000 people are caught up in a standoff at a Cairo mosque , officials say . NEW : State TV reports 821 Muslim Brotherhood members arrested . Conflicting casualty figures put the death toll in Cairo between 17 and 54 . Roving armed groups are sporadically clashing in Cairo , state media reports .