Doreen Lawrence told the Home Affairs Select Committee today that she and her family were uncomfortable with some of the questions they were asked by the Liaison Officers after Stephen's murder.
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One woman reportedly broke down into tears when she was handed the card when getting off the tube.
Police say they will not tolerate hate crime and are urging victims to report offences to authorities.
The report warns that children are more susceptible to the effects of air pollution, and argues that more needs to be done to cut emissions.