By Marco Cacciati in Berlin An international oil tanker and its crew remain in the custody of the Nigerian authorities, after they were arrested more than three months ago in unclear circumstances. Nigeria is reportedly about to prosecute everyone on board with piracy charges, under the Suppression of Piracy and Other Maritime Offences Act 2019 (SPOMO). Marshall Islands-flagged “Heroic Idun” – owned by Ray Car Carriers, operated by Norwegian manager OSM Ship Management and sub-chartered to oil major BP – had been due to load cargo from Nigeria’s Akpo Terminal on August 8. The routine loading t…