UK: https://www.gov.uk/foreign-travel-advice
USA: http://travel.state.gov/content/travel/english.html
Canada: http://travel.gc.ca/travelling/advisories
Australia: http://www.smartraveller.gov.au/zw-cgi/view/Advice/Index
New Zealand: https://www.safetravel.govt.nz/travel-advisories-destination