Authorities launch a criminal investigation into a huge explosion last month at a fertiliser plant in Texas killed 14 people and wounded 200.

The US Internal Revenue Service apologises for improperly subjecting conservative political groups to extra review, a tax official says.

Olympic team-mate Iain Percy leads the tributes to Andrew Simpson, who has died in a training accident.

America's Cup chiefs, San Francisco police and the US Coast Guard to investigate the death of British sailor Andrew Simpson.

The man accused of holding three women hostage for at least a decade fathered the child rescued with them, authorities confirm, citing a DNA test.

Prince Harry continues his tour of the US, laying a wreath at the tomb of the Unknown Soldier at Arlington National Cemetery in Virginia.

The spire is installed atop One World Trade Center in New York, making it the tallest building in the Western hemisphere.

Talking points about an attack on a US consulate in Libya were edited by the state department to remove references to terrorism, US media report.

A teenager from London wins a $100,000 fellowship from one of the original Facebook investors and the man behind PayPal.

A woman has been killed by a pack of pit bull terriers while she was jogging in Los Angeles County, California police say.

Prosecutors say they will seek aggravated murder charges that could carry the death penalty against alleged Cleveland abductor Ariel Castro.

Boston bombing suspect Tamerlan Tsarnaev already held extreme views when he visited Russia last year, Islamists in Dagestan tell US media.

The US government has demanded that designs for a 3D printed gun be taken offline, citing fears over arms-control laws

Chris Kelly, one half of the 1990s rap duo Kris Kross who died last week at the age of 34, is laid to rest in his home town of Atlanta.

British gold medal-winning sailor Andrew Simpson dies as his catamaran capsizes during a practice session for the America's Cup in San Francisco.

An American World War ll veteran who lost his military dog tag in France nearly 70 years ago has finally been reunited with it.

Prince Harry begins his week-long tour of the US by meeting Michelle Obama and honouring America's military mothers with her at the White House.

Seven people are charged in New York over an alleged bank heist which saw cybercriminals steal $45m (£29m) from ATMs worldwide.

Should social network ban violent video clips?

G7 finance ministers are meeting in the UK this weekend to discuss banking and financial reforms.