Dangerous dogs are being traded for thousands of pounds as part of drug deals and debt payments by gangs.
A new report from Middlesex University says dogs like mastiffs and pit bulls are being bred to make money, and being used as a commodity to be traded. Paul Brand reports:
More top news
Police investigating the Grenfell Tower fire have "reasonable grounds" to suspect corporate manslaughter may have been committed.
Charlie Gard will "inevitably" die shortly after being moved to a hospice and having life-support treatment withdrawn.
The service has 1,366 people rammed into a dozen carriages designed for just 640.