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