A Norwegian man being investigated over the Westgate terror attacks is Hassan Abdi Dhuhulow, the BBC's Newsnight programme learns.

Despite being home to about 16,000 tree species, just 227 "hyperdominant" species account for half of Amazonia's total trees, a study suggests.

A shot is fired, petrol bombs are tossed and police cars torched as at least 40 people are arrested at a shale gas protest in New Brunswick province.

Union leaders say 90% of Brazil's state oil company are on strike against planned auctions for rights to explore the huge offshore Libra oilfield.

The brain uses sleep to wash away the waste toxins of a hard day's thinking, US researchers have demonstrated.

A court in Chile convicts four men for torturing and beating to death 24-year-old gay man Daniel Zamudio in a Santiago park in March.

San Francisco's commuter rail could face a second strike in a year as negotiations between labour unions and the transit agency reach an impasse.

Toyota is recalling 885,000 vehicles, mainly in North America, to fix a problem that could lead to airbags being disabled or inadvertently deploying.