Haditha has remained an outpost of resistance, but its nearly six-mile-long dam that is the country’s second-biggest producer of hydroelectric power makes it a valuable prize for the Islamic State.
The explosion targeted a marketplace filled with Shiites shopping for the Eid holiday.
U.S. and Iranian military advisers assist Iraq, but the countries don’t want to be seen as working together.
The items were found by U.S. forces during an operation targeting an Islamic State leader in Syria.
Sunni nations are worried that cash from sanctions relief will help Shiite Iran increasingly fund proxy wars.
The operation was backed by intensive U.S. airstrikes in Ramadi, the provincial capital.
Iraqi forces have bombarded the city in recent days as Shiite militias say Fallujah is their main priority.
The bomb was dropped because of a “technical fault” during a sortie that targeted Islamic State militants.
The wave of attacks was one of the most sophisticated assaults on Egypt’s powerful army in decades.
Tribal feuding, sectarian distrust and security concerns complicate the return of displaced families.