Daily deals firm Groupon reports first-quarter results ahead of market expectations, with revenues up 7.5% and its net loss narrowing to $3.24m (£2.1m).

A source close to the investigation tells the BBC at least two Ohio women missing for about a decade were raped by their captors and threatened.

The US Air Force strips 17 officers of the authority to control nuclear intercontinental ballistic missiles, US media report.

A US teen is charged with homicide by assault after allegedly punching a football referee who later died in hospital in Salt Lake City.

Police say three Ohio women held captive in a house for about a decade were tied up and chained, as two of the victims go home.

US has the most sleep-deprived students in the world

Whistleblower Thomas Drake speaks to HARDtalk's Stephen Sackur about his concerns over secret surveillance in the US.

A Cubist painting by Fernand Leger owned by pop star Madonna is auctioned for $7.2 million (£4.7m) in New York.

Scientists have announced the discovery of a new species of bone-headed dinosaur, which is the oldest in North America, and possibly the world.

Police in Cleveland, Ohio, are due to question three men suspected of kidnapping three women and keeping them hostage for about a decade.

George Lucas, Nick Park and other directors pay tribute to visual effects master Ray Harryhausen following his death at the age of 92.

Tim Lambesis, lead singer of US heavy metal band As I Lay Dying, is arrested on suspicion of attempting to plot the murder of his estranged wife.

A former South Carolina governor who left office in disgrace after admitting an extramarital affair wins election to the US Congress.

Will legal cannabis bring profits or pitfalls in US states?

The man accused of killing 12 people and injuring dozens in the July shooting at a Colorado cinema will plead not guilty by reason of insanity, his lawyers say.

Visual effects master Ray Harryhausen, whose stop-motion wizardry graced such films as Jason and the Argonauts and Clash of the Titans, dies in London at the age of 92.

The Dow Jones index closes above 15,000 for the first time as strong German factory data pushes US and European share markets higher.

As Pentagon figures show a rise in sexual harassment and assaults in the US military, President Obama says it will no longer be tolerated.

Gun homicides in the US have fallen sharply since peaking in 1993, two studies reveal, as a renewed gun control debate rages in Washington DC.

Officials praise three women found alive along with a six-year-old girl in a Cleveland home, after vanishing about a decade ago.