A judge orders Brazil's lower house of Congress to start impeachment proceedings against Vice-President Michel Temer amid a widening political crisis.

Turkey should consider stripping terrorism supporters of their citizenship, President Recep Tayyip Erdogan says.

Facebook-owned messaging app Whatsapp heightens security for information sent through the service.

Twenty-one people are arrested after US authorities set up a fake university to expose immigration fraud.

One of two rival governments in Libya has announced that it is stepping down, a justice ministry statement says.

Russian police raid 25 premises in Moscow and St Petersburg linked to the Japanese Aum Shinrikyo cult, notorious for a nerve gas attack in Tokyo.

A "profoundly disturbing" rise in the number of executions worldwide saw more than 1,630 people put to death last year, Amnesty International says.

US presidential candidates Ted Cruz and Bernie Sanders have won the Wisconsin state primary, US media project.