Two ambulance service workers arrested on suspicion of manslaughter as part of a two-year investigation into six deaths are accused of leaving sick patients to die at home rather than transfer them to hospital, the Daily Mail understands.The co-workers - a man and a 59-year-old emergency care assistant (ECA) - are alleged to have manipulated the patient observation system to allow them to leave 999 call-outs early, according to a well-connected source.The paramedic is accused of six counts of gross negligence manslaughter and four counts of ill-treatment or wilful neglect by a care worker while the ECA faces a charge of gross negligence manslaughter.They worked for the South Western Ambulance Service which has faced historic claims of bullying and harassment.Both have been released on bail while enquiries continue.The Daily Mail has been given the identity of the suspects but has decided not to publish for legal reasons.A major investigation was launched after a report was first made to Wiltshire police in 2023.The source revealed: 'From what I understand they attended emergency calls-outs and in certain cases changed their observations on the system so the patient appeared 'well' meaning they could leave them at home. Two ambulance service workers were arrested on suspicion of manslaughter as part of a two-year police investigation into six deaths in Wiltshire. (File image of South Western Ambulance Service vehicle)'These were sick patients who needed to be taken to hospital.'Why they supposedly did this, whether it was an arrogance to get home on time or that they simply couldn't be bothered, is not yet clear.'I know it's a very technical case to prove.'Ambulance crews use an electronic patient record (EPR) system, a digital platform that consolidates a patient's entire medical history and care interactions into a single, accessible location, including clinical notes, diagnoses, medications, treatments, and test results.Police arrested the paramedic in June last year.Plain-clothes detectives swooped on his family home in unmarked cars and vans and searched the property for two-days, at one point bringing in a sniffer-dog.The paramedic eventually returned to the house - on a new-build estate - but was suspended and later dismissed from the South Western Ambulance Service.Police arrested the ECA in March this year and searched her home, a country cottage.South Western Ambulance Service NHS Foundation Trust said the deaths were an 'isolated incident'.A spokesperson said: 'As soon as the Trust became aware of any concerns, we immediately initiated an internal investigation which resulted in a prompt police referral, and we have been working closely with them as part of the ongoing investigation.'Two members of staff were suspended. The suspension of the two members of staff meant that they were immediately relieved of all duties, including the treatment of patients.'We would like to reassure people that this is an isolated situation and there is no on-going risk to patients. Please continue to call 999 in a life-threatening emergency.'One of the two individuals that were initially suspended, is no longer employed by the Trust.'Due to the ongoing investigation, there will be no further comment at this stage.' DCI Phil Walker (pictured) of Wiltshire Police previously confirmed a man in his 30s and a 59-year-old woman had been arrested as part of the two-year investigationIn an internal email, South Western Ambulance Service NHS Foundation Trust told staff that the probe 'follows a concern raised by the Trust to Wiltshire Police'.They added that it led to the 'immediate suspension of one member of staff, and their subsequent dismissal' followed by 'the suspension of a second member of staff'.Wiltshire Police declined to comment on the nature of the allegations.A spokesman said: 'To preserve the integrity of our ongoing investigation and ensure the appropriate safeguarding of those involved, we will not be providing a running commentary on speculation.'However, Detective Chief Inspector Phil Walker, from the major crime investigation team, said: 'We can confirm that a major investigation is under way relating to several adult deaths in and around Wiltshire.'This investigation has been ongoing since an initial report was made to Wiltshire Police in 2023 and detailed inquiries have been undertaken since to ascertain the facts.'In June 2024, we arrested a man in his 30s from West Wiltshire on suspicion of six counts of gross negligence manslaughter and four counts of ill-treatment or wilful neglect by a care worker.'In addition, in March this year we arrested a 59-year-old woman on suspicion of gross negligence manslaughter.'Both have been released on conditional bail while our inquiries continue.'Our focus is on supporting the families and loved ones of those who have died, and we would ask the media to respect their privacy at this time.'Gross negligence manslaughter requires the breach of an existing duty of care, which gives rise to a serious and obvious risk of death, according to the Crown Prosecution Service.South Western Ambulance Service was rated as 'good' following its most recent inspection by health watchdog the Care Quality Commission in 2022, having made improvements since previous inspections.The trust was rated as 'outstanding' for care and 'good' for its response times, effectiveness and leadership, however its emergency and urgent care services was rated as requiring improvement.One South Western Ambulance station was dubbed the 'Mafia Station' following an internal investigation into claims of bullying, intimidation and harassment in 2022.