in turkey will be trying to make it through to the european union. the bloc announced today that it would halt forced returns and as the fighting continues across the country, it will continue to impact the civilians. here's the head of the british armed services on what it will take to stop this humanitarian crisis from deepening. i think we have already got a humanitarian tragedy. the question now is whether it gets worse or not, and so much of that depends upon how the parties now behave and whether or not the afghan government can bind together the population that it governs still to provide a real unity and real confidence and a real sense of purpose to be defiant. and if they can do that then there is every reason to suppose that the parties will have to come together to talk about the future at a table. scientists are testing an artificial—intelligence system that may be able to diagnose dementia after a single brain scan. it could also predict how quickly the condition will advance. over the next 20 years it's thought the number of people with dementia in the uk will almost double to 1.6 million. our science correspondent, pallab ghosh, reports careful over here. penelope clark noticed that her husband, dennis, began to forget things last year.