Harvard University imposes academic sanctions on dozens of students for cheating in a final exam, a dean says in an email to students.

For many people around the world, American Football is difficult to understand. Franco Cuen, a young player explains the basics with lemons and tangerines

The White House leads tributes to former New York City Mayor Ed Koch, who has died at the age of 88.

Hillary Clinton says the world is a safer place, in her farewell address to state department staff on her last day as America's top diplomat.

President Barack Obama's administration unveils an opt-out for religious groups that object to covering birth control in their staff health plans.

Former New York City Mayor Ed Koch has died aged 88.

The main US share index closes on Friday at a five-year high, buoyed by data showing the economy added more jobs than previously estimated at the end of 2012.

Space monkey, Hagel and Koch in 140 characters or fewer

A Canadian navy intelligence officer who sold military secrets to Russia makes an emotional apology to his family at a sentencing hearing.

New Orleans' Super Bowl venue is restored after Katrina

Photographer Stephen McLaren's explores New Orleans

Vancouver police investigate an apparently random stabbing attack inside an apartment building that left six people in hospital.

Police step up their presence near a bunker where an Alabama man is holding hostage a five-year-old boy he abducted apparently at random on Tuesday.

America's National Football League championship game, known globally as the Super Bowl, takes place this weekend in New Orleans.

World media pleased with new US secretary of state

Ed Koch, New York's colourful and controversial mayor from 1978 to 1989 during some of its darkest years, has died aged 88.

New York's outspoken former mayor Ed Koch remembered

Retired Los Angeles Cardinal Roger Mahony, who is accused of mismanaging a child sex abuse crisis, is stripped of public duties by his successor.

Has Hillary’s journey ended, or is more to come?

Singer Beyonce has admitted miming during her rendition of the American national anthem at the inauguration of President Obama last month.