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Vice President Mohamed ElBaradei, a Nobel Peace Prize laureate and pro-reform leader in the interim government, resigned in protest over the assaults as the military-backed leadership imposed a month-long state of emergency and nighttime curfew.

ElBaradei was named only last month as interim President Adly Mansour’s deputy for foreign relations.

In his resignation letter, he wrote that he is not prepared to be held responsible for a “single drop of blood,” and that only more violence will result, according to a copy that was emailed to The Associated Press. He said Egypt is more polarized than when he took office.

Clashes broke out elsewhere in the capital and other provinces, injuring more than 1,400 people nationwide, as Islamist anger spread over the dispersal of the six-week-old sit-ins of Morsi supporters that divided the country. Police stations, government buildings and Coptic Christian churches were attacked or set ablaze.

The violence drew condemnation from other predominantly Muslim countries, but also from the U.N. and the United States, which said the crackdown will only make it more difficult for Egypt to move forward.