Nebraska Senator Ben Sasse says he won't back Republican front-runner Donald Trump, the highest-ranked party member to do so, on the eve of "Super Tuesday".

One of Google's self-driving cars crashed into a bus in California last month. There were no injuries.

The indigenous rights agency in Colombia expresses concern as ELN fighters move into areas traditionally held by Farc rebels.

The Nigerian government removes nearly 24,000 workers from its payroll after an audit revealed they did not exist, the Finance Ministry said.

The head of Iran's judiciary accuses moderates of working with the West as results suggest gains for reformists in parliamentary elections.

The UN is to use a temporary lull in fighting in Syria to deliver much-needed aid to tens of thousands of people living in besieged areas.

German Chancellor Angela Merkel says Europe cannot allow Greece to fall into chaos after several members introduced restrictions stranding migrants.

The Indian government is set to unveil its budget on Monday as it faces pressure to boost growth while also appealing to the country's poor.