Colombia has become recognized as the expert in dealing with large-scale drug gangs. Colombian success in crippling its own drug gangs has led Mexico and Peru to seek help in dealing with similar problems. Much of the South American (still largely Colombian) cocaine ends up in Mexico, for movement into the main market; the United States. This has led to growing violence between competing Mexican gangs, as well as the gangsters fighting the police. Colombia has moved to share techniques with Mexico, which has included over 5,000 Mexican police receiving counter-gang training in Colombia. Peru is seeking similar help because the Colombian drug gangs are being driven across the border to Peru.