MGM Resorts cyberattack: Casinos warned to be on 'high alert' as £11bn firm remains crippled

MGM Resorts has seen its share price decline by more than 6% .

The $14bn ( 11.2bn ) company operates hotel and gaming venues around the world.

Pictures posted on social media this week showed slot machines not working.

There have also been problems with guests' digital room keys and corporate email address.

Experts say casinos are prime targets and should be on high alert.