Majid Takht-Ravanchi, Iran's deputy foreign minister, tells the BBC's Lyse Doucet that the ball was "in America's court to prove that they want to do a deal".

There is no innocent explanation for the toxin being found in samples taken from Navalny's body, Foreign Office says.

Savannah Guthrie's fame has helped turn her mother's abduction into a national obsession.

Assailants shot dead or cut the throats of their victims, lit homes on fire and abducted multiple people in Niger state, Nigeria.