A dementia sufferer forgotten by charity staff was left in a locked bus in the cold for 45 minutes.
The woman, believed to be in her 80s, had to bang on the windows to get attention after she was left in a depot by Alzheimer's Society staff.
Two people have now been suspended by the charity.
The bus had been parked at about 4:15pm by a charity worker at the Middlefields depot in South Shields. She was found by South Tyneside Council staff at 4:50pm. The woman was returned home at 6:30pm.
An initial report into the circumstances of what happened has now been completed, and the Alzheimer's Society is carrying out an investigation.
Fewer than half of the people suffering from dementia, who currently live in care homes, enjoy a good quality of life, a charity has warned.
The report from the Alzheimer's Society also found that record numbers of people in care homes have the condition.
It said 80 per cent of people in residential care homes have either memory loss or dementia.
Previous estimates put the number of people with the condition at just over 60 per cent.
The Alzheimer's Society is encouraging people to learn about dementia in order to make those suffering from the disease feel included and understood.
Alzheimer's Society research shows that 41% of people in the North East feel they have a role to play to support people with dementia, but only 48% feel they have a good understanding of the disease.
'Dementia Friends' is an initiative to help a million people understand how to speak sensitively to a person suffering from dementia. The project helps people to make those with dementia feel included and understood.
The Alzheimer's Society is trying to recruit a million 'Dementia Friends'. They want people to go and visit those suffering from the disease. Volunteers can register on the Alzheimer's Society website.