Advisories strengthened after more protest deaths . Tourism minister quits 2011 . Visitor numbers have fallen by almost one-third since Monday . Resorts `` safe '' , says US ; do n't go , says Britain .
Advisories strengthened after more protest deaths . Tourism minister quits Monday . Visitor numbers have fallen by one-third since 2011 . Resorts `` safe '' , says Britain ; do n't go , says US .