ROSEVILLE, Mich. -

Hoffa pic Soil samples taken from a Roseville backyard in connection with a search for the remains of Jimmy Hoffa show no sign of the presence of human remains.

Investigators pulled the samples Friday acting on a tip that the remains of the missing Teamsters boss Hoffa could be buried beneath a slab of concrete.

Hoffa was last seen July 30, 1975, outside a restaurant in Oakland County, more than 30 miles to the west. The day he disappeared, Hoffa was supposed to meet with a New Jersey Teamsters boss and a Detroit mafia captain.

The Local 4 Defenders have learned a man who is seriously ill and dying from cancer told Roseville police he saw men moving a black bag at the house's garage hours after Hoffa went missing more than 35 years ago. The house is on Florida Street near Kelly Road.

"About a month or so ago, an individual gave me a call who wanted to talk about a body that he allegedly witnessed being interred here in the city of Roseville approximately 35 years ago," said Roseville Police Chief James Berlin. "That lead us to where we're at today."

Officials did radar tests on the ground at the home this past week.

The tipster said he wasn't in the mafia himself, but ran with bookies -- one of whom allegedly lived in the Roseville home in 1975.

SLIDESHOW: Search begins for Jimmy Hoffa's remains in Roseville

Published On: Sep 28 2012 10:02:58 AM EDT

Michigan investigators began taking soil samples Friday from underneath a driveway in Roseville in the latest effort in a decades-long investigation to figure out where missing Teamsters boss Jimmy Hoffa may be buried.

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