HMS Duncan (seen above sailing out of the Black Sea), a Type 45 destroyer, will replace HMS Montrose in the region as Tehran threatens to retaliate against British shipping in the region after Royal Marines seized an oil tanker off Gibraltar last week (the tanker, Grace 1, is pictured inset). The Montrose has already had to confront three Iranian vessels in the region, Britain says, as Iran warned today that Britain will be ‘slapped in the face’ for ‘daring’ to capture the ship. Britain’s capture of the Grace 1 was ‘not valid’, Tehran’s foreign ministry said, adding: ‘This is a dangerous game and has consequences.’ Tensions are already spiralling in the Middle East amid exchanges of angry rhetoric between America and Iran and the breakdown of the 2015 nuclear deal. Theresa May’s deputy spokeswoman said: ‘We are talking to the US about building on our presence in the face of recent threats to shipping in the area.’ Original Article: http://www.dailymail.co.uk/news/article-7240011/Iran-demands-Britain-immediately-releases-oil-tanker.html Original Video: http://www.dailymail.co.uk/video/news/video-1964228/Video-Hunt-says-Britain-doesnt-want-escalate-tension-Iran.html Daily Mail Facebook: http://facebook.com/dailymail Daily Mail IG: http://instagram.com/dailymail Daily Mail Snap: https://www.snapchat.com/discover/Daily-Mail/8392137033 Daily Mail Twitter: http://twitter.com/MailOnline Daily Mail Pinterest: http://pinterest.co.uk/dailymail Daily Mail Google+: https://plus.google.com/+DailyMail Get the free Daily Mail mobile app: http://dailymail.co.uk/mobile