CAIRO — Sudan's Prime Minister Abdalla Hamdok announced his resignation Sunday amid political deadlock and widespread pro-democracy protests following a military coup that derailed the country's fragile transition to democratic rule.

Hamdok, a former U.N. official seen as the civilian face of Sudan's transitional government, had been reinstated as prime minister in November as part of an agreement with the military following the October coup. In that time he had failed to name a Cabinet and his resignation throws Sudan into political uncertainty.