Updated

Egypt's Health Ministry says the death toll from street violence Friday has risen to four, hours before authorities release the results of this week's constitutional referendum.

The ministry said Saturday that 15 people were also injured in the clashes, which began after supporters of the ousted Islamist president took to the streets in Cairo and other provinces to denounce the draft charter. Police fired tear gas and arrested dozens in their crackdown on demonstrations held without permits.

Since a popularly backed military coup overthrew Mohammed Morsi in July, Islamists have been staging near-daily protests against interim authorities they consider illegitimate. Demonstrations often end violently.

An initial, informal count showed more than 90 percent of voters backed the document. Official results will be announced by the high electoral committee later Saturday.