Health officials in Florida investigate four cases of Zika that do not appear related to travel, raising fears US mosquitoes may be carrying the virus.

A top UN official says the Boko Haram group is guilty of "almost unimaginable" brutality in Nigeria as troops battle to push it back.

Animals in one of Venezuela's main zoos are reported to be dying of hunger because of chronic food shortages.

Around 70 members of the Russian Olympic team leave a Moscow airport for Brazil to take part in Rio 2016 while others stay at home, banned for doping.

Australia's most senior Catholic, Cardinal George Pell, calls claims he sexually abused children "a scandalous smear campaign".

Security is boosted at South Korea's embassy in Hong Kong where a North Korean defector is reported to have sought asylum.

US President Barack Obama implores voters to continue his legacy by carrying Hillary Clinton to victory, in a rousing speech at the Democratic convention.

Investigators in France believe they are close to identifying the second of two men who murdered a priest in a church on Tuesday, reports say.