Mystery swirls around what caused ammonium nitrate to explode in Beirut

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A drone picture shows the scene of an explosion that hit the seaport of Beirut, Lebanon, Wednesday, Aug. 5, 2020. A massive explosion rocked Beirut on Tuesday, flattening much of the city's port, damaging buildings across the capital and sending a giant mushroom cloud into the sky. (AP Photo/Hussein Malla)

Unconfirmed picture appears to show workers welding door of warehouse filled with chemical; report says authorities warned of dangers for years

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