A dispute over a game of billiards sparks sectarian clashes in Nigeria that leave four people dead and dozens of buildings on fire, police say.

The US space agency marks the 25th anniversary of the wreck of the Space Shuttle Challenger, which killed all seven astronauts aboard.

Google's Eric Schmidt explains his new role as executive chairman and tells the BBC about his ambitions in China.

The Illinois supreme court rules that President Obama's former chief of staff Rahm Emanuel can run to be Chicago mayor, overturning a prior decision.

Ireland's lower house of parliament passes a finance bill seen as key to meeting conditions of an 85bn euro EU and IMF rescue package.

Egyptian forces are on high alert as thousands prepare to join anti-government rallies after Friday prayers, amid reports of mass internet disruption and arrests of opposition figures.

Brazil says it will build 8,000 free houses for people made homeless by floods and landslides in Rio de Janeiro state.

With about 50m left to drill, time is running out for scientists drilling into a lake hidden deep below the Antarctic ice.