An ongoing Associated Press investigation has uncovered deep, previously unreported flaws within the Bureau of Prisons over the last few years, including widespread criminal activity by employees, dozens of escapes, the free flow of guns, drugs and other contraband, and severe understaffing that has hampered responses to emergencies.

Explosions and fires rocked Sudan's main port city and wartime capital Port Sudan on Tuesday, a witness said, part of a days-long drone assault that has torched the country's biggest fuel depot, damaging the most important gateway for foreign aid.