State Department official says terror group smuggling ammonium nitrate in first aid kits for use in terror attacks, calls on European states to impose bans on organization

Reuters investigation spanning 10 countries and many officials and firms only uncovers denials, missing documents and refusals to comment

The MV Rhousus stopped at the Lebanese port in 2013 to pick up some cargo, but legal and technical difficulties led it to be detained and its explosive cargo impounded

Beirut disaster leads Indian authorities to order swift review of hazardous materials at ports; local officials say compound is safely stored, in process of auction

Former port worker tells paper pyrotechnic devices were seated right alongside explosive compound; new documents show officials long warned of explosive chemicals at port

The chronology of Lebanon's singular disaster runs through the ship MV Rhosus, its allegedly dodgy owner, a volatile cargo and a blatant disregard for danger by authorities

Sources say explosion was likely result of an accident, though it was not out of realm of possibility it was deliberate

Odorless crystalline substance used as fertilizer has been the cause of numerous explosions over the decades; expert believes a small explosion may have ignited it in Beirut

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