The Federal Bureau of Investigation said today "there are strong preliminary indications" that the Tuesday shooting that killed Border Patrol Agent Nicholas Ivie, and left another agent wounded and a third agent unharmed, was an accident involving friendly fire.

In a statement, the agency emphasized its investigation of the case is ongoing, but said, it "was the result of an accidental shooting incident involving only the agents."

The Border Patrol is planning to hold a news conference later today. The FBI titled its statement on the matter "final."

"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," the FBI's statement said.

The investigation continues, and agents are "utilizing all necessary investigative, forensic, and analytical resources in the course of this investigation," the agency said in the statement.

U.S. Secretary of Homeland Security Janet Napolitano traveled to Naco, Ariz. today from Washington, D.C. to meet with Ivie's family and officials at the Border Patrol station about the shooting.