BEIRUT—The two,750 metric tons of ammonium nitrate sailed into the metropolis practically 7 decades back. The ship’s captain at the time known as it a “powder keg.”

The cargo, a chemical compound applied for blasting mines and making motor vehicle bombs, was seized when the ship carrying it was found unseaworthy and its proprietor unsuccessful to shell out certain costs, in accordance to the ship’s captain and the Intercontinental Transport Workers’ Federation, a world-wide trade union. It finished up in a warehouse as Lebanese officials, legal professionals, judges and a Russian shipper bickered…