SIERRA VISTA - Rumors of an arrest in the shooting death of Border Patrol agent Nicholas Ivie are swirling but law enforcement agencies will not comment on the matter.

Chief Deputy Rod Rothrock who is executing the office of the sheriff said rumors of an arrest in Mexico could not be confirmed. He said several of his deputies were continuing to assist the FBI in the investigation late Wednesday.

A spokeswoman for the FBI said crime scene investigations typically take two days but as of Wednesday evening it had not been complete.

Chief Deputy Rothrock said his department has a specialized unit known as the Narcotics Enforcement Team that is familiar with the area where the shooting occured, "I don't think it's a secret to the citizens of Cochise County that our border situation is perilous. It is not safe and it is not secure and it is a situation that can extend north of the border itself."

He said his deputies were working at 100 percent to find the killer, "We have a responsibility to engage criminal activity and we're going to continue to do that and we have to trust on our training and ability and sometimes a modicum of luck."