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This week's fatal shooting of a U.S. Border Patrol agent and the wounding of another in Arizona was likely the result of friendly fire, the FBI said late Friday, CNN reported.

"While it is important to emphasize that the FBI's investigation is actively continuing, there are strong preliminary indications that the death of United States Border Patrol Agent Nicholas J. Ivie, 30, and the injury to a second agent was the result of an accidental shooting incident involving only the agents," James Turgal, special agent in charge of the FBI's Phoenix division, said in a statement.

"At the appropriate time further information will be provided, but while the investigation continues it would be inappropriate to comment any further at this time," he said.

Earlier, a law enforcement official said investigators at the scene had not found shell casings except those believed to have been fired by the Border Patrol agents.

Investigators are awaiting results of ballistics tests, said the official, who was not authorized to speak for attribution about the investigation.