It is understood that bus and driver directories were among the areas targeted by the apparent hackers on Monday. Any service delays will be posted on the relevant Twitter account, a spokesperson told Sky News. Go-Ahead, which is also a major player in other cities including Brighton and Newcastle, said the incident was ongoing. Its statement said: “Go-Ahead announces that it is currently managing a cyber security incident following detection of unauthorized activity on its network on Monday 5 September 2022. “Upon becoming aware of the incident, Go-Ahead immediately engaged external forensics and took proactive measures with its IT infrastructure while continuing to investigate the nature and extent of the incident and implement its incident response plans. “Go-Ahead will continue to assess the potential impact of the incident but confirms that there is no impact on UK or international rail services operating as normal. “As a precautionary measure, Go-Ahead has informed the relevant regulatory authorities, including the Information Commissioner’s Office in the UK.” Go-Ahead London is the capital’s largest bus company, with more than 2,400 buses. The company said later on Tuesday that it had managed to avoid disrupting passengers so far and expected to run regular services on Wednesday.