The letter warns cyber-attacks which use AI will become more sophisticated in a matter of months.
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Jury deliberating in trial of Lindsay Clancy, US woman accused of killing her children
Prosecutors argued Clancy made a calculated decision to murder the children, while the defence argued that she was suffering from postpartum psychosis.
What we know so far
Hundreds have died or are missing in Wednesday's flooding and landslides on the border of Nepal and Tibet.
'Mortified' McInnes takes responsibility for Rangers' European exit
Manager Derek McInnes says he take "full responsibility" for Rangers' "embarrassing" Conference League exit at the hands of Jablonec.
Extra 200 police drafted in to aid force investigating wrong-way crash and fire deaths
Cleveland Police confirms it has support from six local forces and the National Crime Agency.
Trump signs order to rename Lake Ontario to Lake America
Trump's order comes after the trade talks between the US and Canada collapsed late last week.
Sports Direct founder Mike Ashley attacks Burnham's 'populist' High Street plans
In a letter, the entrepreneur accuses the prime minister of "jumping on 'everyday fixes' or bandwagons" with his latest cost of living and retail policies.
France relaxes strict cheese-making rules after prolonged drought
Makers of some of France's most famous cheeses get waivers on where herds graze due to the lack of grass.
Chelsea agree £7.5m fee for Villa's Martinez
Chelsea agree a £7.5m fee to sign Aston Villa goalkeeper Emiliano Martinez.
Allan Little: I met dangerously fanatical Mladić early in Bosnian war
BBC special correspondent Allan Little met the "Butcher of Bosnia" in the early months of the Bosnian war.
Smith & Cox help England to 248-9 on truncated day one
Jamie Smith and Jordan Cox battle difficult conditions and an improved Pakistan performance to take England to a competitive total on the opening day of the second Test.
Jury deliberating in trial of Lindsay Clancy, US woman accused of killing her children
Prosecutors argued Clancy made a calculated decision to murder the children, while the defence argued that she was suffering from postpartum psychosis.
Norwegians lay flowers at palace as King Harald's condition worsens
The 89-year-old's condition is described as "extremely serious" and members of his family have visited him in hospital.
Man City and Aston Villa to face holders PSG - check full details of Champions League draw
European champions Paris St-Germain will face Premier League duo Manchester City and Aston Villa in the league phase of this season's Champions League.
Man City and Aston Villa to face holders PSG in Champions League
European champions Paris St-Germain will face Premier League duo Manchester City and Aston Villa in the league phase of this season's Champions League.
BBC director-general says he was not aware of 'severity' of cuts needed
Matt Brittin succeeded Tim Davie as boss of the BBC in May.
What we should make of CIA boss's secret trip to Moscow
There is nothing routine about John Ratcliffe making a secret, 10,000-mile return dash to Moscow, writes Frank Gardner.
Watch: Tracing the deadly path of the Nepal-Tibet flash flood
BBC Verify traces the path of the destructive Nepal-Tibet flash flood using verified video.
Norwegians lay flowers at palace as King Harald's condition worsens
The 89-year-old's condition is described as "extremely serious" and members of his family have visited him in hospital.
Has Social Media For Children Just Changed Forever?
Tech giant Meta will pay up to $18billion to settle claims its platforms harm children
Optimus Prime and Eeyore voice actor Peter Cullen dies
Cullen voiced the heroic Optimus Prime in the Transformers TV series and then the Hollywood films.