A ship stranded at anchor off the Kent coast due to fears over its potentially explosive cargo poses “no threat in its current state”, its owners have reassured. Ruby – a vessel registered and owned in Malta – is carrying about 20,000 tonnes of ammonium nitrate from Russia but suffered damage soon after leaving port six weeks ago. For more than a week, she has been located at an anchorage point about 15 miles off Margate – but is located in international waters – and being monitored by the UK Coastguard. Due to the volume of the chemical on board – which is used in agricultural fertiliser – an…