Cyber hackers are threatening to bring Glasgow's rail network to a halt during COP26.
Police and security services are on high alert as the city's infrastructure is put at risk.
It's understood there is a viable threat to sabotage the 12-day climate change summit when 30,000 delegates, including US President Joe Biden gather, the Sunday Mail reports.
A specialist team has been set up by Police Scotland as the IT systems of large companies and government bodies are also put at risk.
Security at Strathclyde Passenger Transport (SPT) will be stepped up ahead of the event over fears hackers may target computer systems used to operate Glasgow's subway.
Alex Dowall, Detective Superintendent for Cyber Investigations at Police Scotland, said: "We know criminals will exploit any opportunity for their own gain and COP26 will be no different."
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Measures to combat a cyber attack were revealed in an SPT meeting.
The authority plans to ramp up security with Gordon Dickson, head of business strategy and delivery, saying: "We've got a separate group looking at cyber security.
"In terms of the subway, we are having to look at our security requirements for that and working closely with emergency services, security and police on the plans."
The most common cyber threats target websites, social media and email passwords, with bogus emails asking for security information and personal data.
The Scottish Business Resilience Centre operates out of Linlithgow, West Lothian.
It advised: "With less than 100 days to go until COP26, businesses should already be taking steps to protect themselves - both physically and online."
Glasgow City Council has hired its own cyber crime consultant and is planning an exercise to test its response.
The Scottish Government is working with the UK Government, the UN, Police Scotland and the National Cyber Security Centre (NCSC) to resist any attacks.
An NCSC spokesman said: "The NCSC plays an active role in supporting the security of events such as COP26 and we work closely with the Scottish Government and Police Scotland to identify and respond to a range of threats."
