A COMPANY that runs bus services in the city said it had discovered a “cyber security incident”.

Go-Ahead Group, which owns Brighton and Hove Buses, as well as Southern and Thameslink operator Govia Thameslink Railway, said that “unauthorised activity” had been detected on its network yesterday.

A spokesman for the firm said: “Upon becoming aware of the incident, Go-Ahead immediately engaged external forensic specialists and has taken precautionary measures with its IT infrastructure whilst it continues to investigate the nature and extent of the incident and implement its incident response plans.”

He also said there was "no indication that any customer data had been compromised".

"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 which are operating normally," the spokesman added.

The company have notified the Information Commissioner’s Office “as a precaution”.