Four teenage boys were arrested on suspicion of burglary at the former Walthamstow dog track.
The suspects, aged between 13 and 16, were detained on Sunday evening over a suspected burglary at the site, which has been redeveloped for housing.
Met officers say they had been patrolling the area after reports of drug taking, anti-social behaviour and burglary from nearby residents.
The boys have since been released from custody, pending further investigation.
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