Milford Township, Mich. ? The FBI said Tuesday it found no trace of Jimmy Hoffa after digging up a suburban Detroit horse farm in one of the most intensive searches in decades for the former Teamsters boss.

The two-week search involved dozens of FBI agents, along with anthropologists, archaeologists, cadaver-sniffing dogs and a demolition crew that took apart a barn.

Louis Fischetti, supervisory agent with the Detroit FBI, said the tip that led agents to the farm was the best federal authorities had received since 1976.

The agency planned to continue the investigation into Hoffa’s 1975 disappearance.

“There are still prosecutable defendants who are living, and they know who they are,” said Judy Chilen, assistant agent in charge of the Detroit FBI.

The farm was once owned by a Hoffa associate and was said to be a mob meeting place before the union boss’ disappearance.