Britain has not identified the suspects who carried out the poisoning of former Russian double agent Sergei Skripal, but is stepping up protection for other defectors who might also be at risk, the UK's national security adviser says.

The chief executive of UK supermarket giant Sainsbury's burst into song just hours after announcing the company will buy rival Asda.

An Israeli judge issues another extension of the extradition case of Malka Leifer, the Australian-Israeli accused of sexually abusing girls at a Jewish school in Melbourne more than a decade ago.

A letter from Donald Trump's New York physician released by his campaign in 2015 declaring he would be "the healthiest individual ever elected to the presidency" was composed by the candidate himself, the doctor says.

A postcard claiming to be written by the notorious serial killer, dated 11 days before his final suspected victim was found dead and warning of two murders, sells at auction for $49,000.