A cargo ship may have become stuck across a river due to a lapse in concentration, a new report has found. The Baltic Arrow ran aground and blocked the River Nene close to West Walton at 8.48am on June 25 – with it eventually refloated, following unsuccessful attempts to free it, with tug assistance later that evening at 9.50pm. The incident blocked marine traffic heading from Sutton Bridge to the Port of Wisbech, with the Baltic Arrow having passed the Cross Keys swing bridge at Sutton Bridge at 8.14am. It had set sail from Riga in Latvia at 11.30pm on June 19, carrying a cargo of timber. Now…