The British government has issued a fresh warning about the security risks of using Russian anti-virus software.
The National Cyber Security Centre is to write to all government departments warning against using the products for systems related to national security.
The UK cyber-security agency will say the software could be exploited by the Russian government.
Security firm Kaspersky Labs, accused in the US of being used by the Russian state for espionage, denied wrongdoing.
Kaspersky Labs is widely used by consumers and businesses across the globe, although they are not being advised to stop using the software, as well as by some parts of the UK government. Around the world, 400 million people use Kaspersky products.
In other news, Barclays has stopped offering free Kaspersky software to customers as a "precautionary decision".