Billions of pounds owed in child maintenance may never be recovered, government accounts show - though ministers say the debts are not "forgotten".

Thousands of Venezuelans attend an opposition march blaming failed government policies for widespread shortages.

US President Barack Obama arrives in India for a three-day visit, protected by one of India's biggest-ever security operations.

Greeks vote in a general election, with the anti-austerity Syriza and the centre-right New Democracy parties seen as front-runners in a tight race.

Nasa's mission to Pluto gets under way in earnest as the New Horizons probe starts taking the pictures needed for July's close fly-by.

An MEP who defected from UKIP to the Conservatives has branded his old party a "vanity project" for its leader Nigel Farage, who runs it "like a dictator".

An investigation is launched into allegations of fraud and overspending at the trust which runs Broadmoor high security hospital.

US President Barack Obama calls Japan's PM to offer condolences after the apparent murder of a Japanese hostage by Islamic State.