In some instances, evidence suggests that a specific security force carried out multiple disappearances using the same tactics, within a narrow period of time, and in the same geographical area. For example, Human Rights Watch collected witness testimony and photographic and video evidence showing that members of the Navy committed more than 20 abductions in June and July 2011, in the border states of Coahuila, Nuevo León, and Tamaulipas. Almost all of these people were arbitrarily detained by members of the Navy in their homes. The Navy initially denied having taken the men, only to contradict itself later by admitting in news releases that it had come into contact with several of the men before they disappeared. The individuals have not been seen since they were arrested. The common modus operandi in these cases suggests that these crimes may have been planned and coordinated, or at the very least could not have taken place without the knowledge of high-ranking Navy officials.