A Federal Police spokesman says he 's been asked not to comment . All the information is to come from Calderon 's office . Comment: The long-term impact of the shooting will depend on how aggressively the Mexican government pursues the investigation , said Sylvia Longmire , a drug war cartel analyst and author of `` Cartel : the Coming Invasion of Mexico 's Drug Wars . '' Federal police were involved in the shooting , Mexico says .
A Federal Police spokesman says he 's been asked not to comment . All the information is to come from Calderon 's office . Comment: Federal police were involved in the shooting , Mexico says .