World News Update, What you need to know

Democratic presidential frontrunner Hillary Clinton has promised to raise incomes of hardworking Americans and rein in Wall Street excesses in the first major policy address of her 2016 campaign.

ELSEWHERE:

LONDON - The Duke of Cambridge has had a quiet first day in his new job as he said he hopes juggling fatherhood, royal duties and work as an air ambulance pilot will help him become a "grounded individual".

LONDON - A British woman who gave birth in Spain has told of her ordeal after spending weeks trying to convince medics the baby girl was hers.

LEXINGTON - A clerical error at the Lexington County jail allowed the man charged with killing nine people at a Charleston church to buy the gun used in the attack.

NEW YORK - Rapper 50 Cent has filed for federal bankruptcy protection, after a jury ordered him to pay $US5 million ($A6.74 million) in an invasion-of-privacy lawsuit.

ATHENS - Greece's public servants are being called to stage a 24-hour strike for Wednesday, the day their country's parliament is to vote on reforms needed to unlock a crucial eurozone rescue.

LONDON - Thirteen climate change activists are in custody after chaining themselves to railings on the north runway at Heathrow Airport.