The US is confident that North Korea was behind the Sony Pictures cyber-attack because the hackers were "sloppy" enough to leave a trail, says the FBI.

A man claiming to be a senior defector from the Lord's Resistance Army is taken into custody by US forces in the Central African Republic.

Inflation in the eurozone turns negative, official figures show, with prices in December down 0.2% year-on-year, driven lower by falling oil costs.

Muhammad Ali, an icon of the boxing ring, is released from hospital and back home after being admitted last month with a urinary tract infection.

A trial of a potential drug to treat Ebola has started at a Medecins Sans Frontieres centre in Liberia.

The tail of crashed AirAsia flight QZ8501 has been found in the Java Sea, say Indonesian officials, raising hopes of recovering the "black boxes".

The Cuban government has released some of the 53 political prisoners on a US list, the state department says, amid a thaw in US-Cuban relations.

President Barack Obama pledges to help Mexico in its fight against drug-related violence, after talks with his counterpart Enrique Pena Nieto.