Mumbai, June 28 -- A day after three vessels - including an Indian-flagged crude oil tanker - crossed the Strait of Hormuz, the Indian-flagged bulk carrier APJ Priti 2 transited it on Saturday via the Iran route, according to an Indian government status report. The vessel was carrying 65,000 metric tonnes of fertiliser cargo and held serial number 9 on the shipping directorate's earlier evacuation priority list. The transit came hours after a tanker carrying Qatari oil was struck within the strait - the second attack on a merchant ship this week - prompting naval authorities to raise the regional threat level to "substantial." The UK Maritime Trade Operations centre said the vessel sustained bridge damage from an unidentified projectile; the crew were safe and there was no environmental damage. The Joint Maritime Information Centre (JMIC), which liaises between navies and merchant shipping, issued the elevated threat assessment after Thursday's strike on the container ship Ever Lovely had prompted the US to retaliate against Iran, with Tehran saying it struck US assets in turn. The International Maritime Organization had separately warned on Friday that around 80 mines could have been laid in the strait; under its agreement with the US, Iran is meant to take responsibility for their removal, though it remains unclear how much of that has been carried out. Fifteen vessels of Indian interest remain stranded in the Persian Gulf, west of the strait, and were identified for evacuation, the directorate said in the same report. These comprise one energy cargo vessel, identified by the ministry of petroleum and natural gas (MoPNG); four fertiliser-carrying vessels, identified by the department of fertilisers under the ministry of chemicals and fertilisers (MoCF); and ten other vessels of Indian interest, identified by the directorate general of shipping (DGS) under the ministry of ports, shipping and waterways (MoPSW)....