Source: ‘Highly credible’ info led to new Hoffa dig; murder put on Detroit mob

Story highlights

NEW: FBI agent says information "reached the threshold of probable cause"

The search is based in part in information provided by an alleged mobster

The FBI has spent months looking into Tony Zerilli's claims

Hoffa, then 62, was last seen on July 30, 1975, outside a Detroit-area restaurant

Oakland Township, Michigan CNN  — 

The FBI – working on information from an aging reputed mobster – began digging in the waist-high grass of a Detroit-area field Monday in yet another search for the remains of former Teamsters boss Jimmy Hoffa, according to a law enforcement source with direct knowledge of the investigation.

The information that sparked the latest hunt in the nearly four-decades-long search for Hoffa is “highly credible,” the source said.

Agents were executing a search warrant for a field in Oakland Township, north of Detroit, based in part on information provided by alleged mobster Tony Zerilli.

The paperwork filed under seal that accompanies the search warrant is described as “several pages long,” according to the source, and it explains why the FBI believes the search is justified.