A cyber-attack aimed at Sweden-based health software company Ortivus has left several of its UK NHS ambulance service trust users struggling to record patient data.

The affected trusts, including South Western Ambulance Service Trust and South Central Ambulance Service Trust serve 12 million people.

With electronic patient records unavailable, staff have reportedly been told that efforts to patch servers are ongoing. Ortivius has said in a statement that “No patients have been directly affected”.