Robert Foley, special agent in charge of the FBI's Detroit division, says the agency and its partners on Monday executed a search warrant in Oakland Township, about 40 km north of Detroit. He says the warrant is sealed and didn't take questions from reporters.
Tony Zerilli told Detroit TV station WDIV in February the FBI had enough information for a search warrant to dig at the site. Zerilli was in prison in 1975 when Hoffa disappeared from a Detroit-area restaurant but told New York TV station WNBC in January he was informed about Hoffa's whereabouts after his release.
Zerilli's lawyer was at the scene Monday. He circulated information that claims his client was part of an inner mob circle that was in the know when it came to Hoffa's death and whereabouts.
Zerilli alleges members of the mob took Hoffa to the property, hit him over the head with a shovel and threw him into a hole where he was buried alive.
None of Zerilli's claims have been proven and police continue to search the property.
Hoffa was president of the Teamsters union until 1971.