Islamic State accepts a pledge of allegiance from Nigeria's militant group Boko Haram, according to an audio message purportedly from IS.

A German biologist who offered $100,000 to anyone who could prove measles is a virus is ordered by a court to hand over the money to a doctor.

The US Coast Guard has ended a search and rescue mission for seven Marines and four soldiers likely killed by a helicopter crash

US investigators say they are satisfied Harper Lee wants to release her second novel, and close an inquiry into allegations she was pressurised.

Brazilian federal police arrest fugitive Italian writer Cesare Battisti, a former communist militant convicted of murder in his home country.

Haiti sets dates for delayed legislative and municipal elections, the cause of months of protest in the country.

Dozens of demonstrators return to the streets of Ferguson, Missouri, one night after two police officers were wounded during a protest.

North Korea fires seven ground-to-air missiles into the sea amid heightened tensions, South Korea's defence ministry says.