An official said Australia's PM has told government colleagues that an early general election within weeks is "a live option."

Per capita, Belgium is the European country that has contributed the most people to fight alongside militant groups such as IS in Syria and Iraq.

Earlier, the World Health Organization warned a disease linked to Zika posed a global public health emergency requiring a united response.

More than one million migrants streamed into Germany last year, and some regions have complained that they are being overwhelmed.

The sanctions law is named after Sergei Magnitsky, a Russian lawyer who died in prison in 2009 after uncovering a large tax fraud scheme.