The Met Police is re-thinking the way it deals with cases involving vulnerable people, by drafting in the help of specialist nurses.
Officers will work alongside medical teams in cases involving people suffering from mental health problems, to make sure they get the specialist care they need.
Today, Marcia Rigg whose brother Sean died in police custody, welcomed the changes - but said they don't go far enough.
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London was today a city of sirens and half mast flags in the wake of another terror attack.
MPs said they would "carry on" and go to work "as usual" in defiance of the terrorist attack outside the Palace of Westminster.
A huge police operation is under way after a terror attack in Westminster.