Driverless cars could be hacked and deployed as "fully loaded weapons", according to the chief executive of Canadian company Blackberry.
Best known for its smartphones, the company is developing software for driverless cars in partnership with Baidu, the Chinese web search giant.
John Chen, Blackberry's chief executive, said driverless cars were programmed with more lines of code than a typical fighter jet, offering enormous scope for hackers to exploit vulnerabilities to insert malware.
"A car could easily be infected with viruses [and] is literally a fully loaded weapon. If hackers can get hold of it, you can imagine what they could do."
He added that the industry was working hard to reduce the risks.