The London Assembly has been quizzing the Commissioner of the Metropolitan Police, over allegations the force engaged in an operation to smear the family of Stephen Lawrence.
A former undercover officer has claimed he was told to find dirt on the family of the murdered teenager.
Ria Chatterjee reports:
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The party's manifesto also included pledges to halt two major transport schemes.
Doctors can stop providing life-support treatment to sick baby Charlie Gard, Court of Appeal judges have ruled.
Armed officers have been patrolling on the London Underground but this is the first time they will travel on trains outside the capital.