The Chilean Supreme Court approves the extradition of former Argentine judge Otilio Romano, accused of human rights abuses under the military government.

Four US soldiers have been killed at Bagram airbase in Afghanistan, hours after the US announced direct talks with the Taliban.

Ecuador's foreign minister says its embassy in London will continue to provide political asylum to WikiLeaks founder Julian Assange.

Suspected Boko Haram militants in Nigeria kill at least nine school children, in what survivors suggest is a response to growing vigilante groups.

The head of the US electronic spying agency tells Congress surveillance programmes leaked to media helped thwart 50 attacks since 2001.

The quality of a performance does not drive the amount of applause an audience gives, a study suggests.

US President Barack Obama arrives in Berlin at the start of a visit during which he will address crowds at the city's famous Brandenburg Gate.

An open letter published in the Lancet medical journal calls for hunger-striking Guantanamo Bay detainees to receive independent medical care.