This article: http://www.bbc.com/news/world-us-canada-34907009 http://www.bbc.com/news/world-us-canada-34907009 says "Previous worldwide travel alerts were is

This article: http://www.bbc.com/news/world-us-canada-34907009 http://www.bbc.com/news/world-us-canada-34907009 says "Previous worldwide travel alerts were issued in May 2011, September 2011, August 2013 and December 2014"