DETROIT – OK, so the May dig at a horse farm in Milford Township, Mich., didn’t produce Jimmy Hoffa. The FBI is still on the case.

On Tuesday, FBI Director Robert Mueller was in Detroit and made it a point to predict that his agency will solve the 30-year-old mystery into what became of the former Teamsters boss.

“We have a long memory,” Mueller said. “We are very willing to follow up on leads.”

As to what those leads may be, the director didn’t elaborate.

Mueller made the comments during a tour of the FBI’s field office in Detroit.

He was on his way to a reconciliation meeting with a mob-connected New Jersey Teamsters official and a Detroit mafia captain.

The FBI has theorized that the men, now dead, had Hoffa killed to prevent him from regaining the Teamsters presidency.

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