A package containing 2.5 pounds of marijuana was delivered to the Kentucky home of Cincinnati Bengals wide receiver Jerome Simpson earlier this week, drug enforcement officials in California said Thursday.

Authorities tracked the package from a mail distribution center in Sacramento to Simpson's home in the Cincinnati suburb of Crestview Hills, Kentucky, said Michelle Gregory of the California Bureau of Narcotics Enforcement. The package originated in Eureka in northern California, she said, and was one of 40 packages authorities were tracking.

The California authorities notified those in Kentucky, who monitored the delivery. Aleen Smith, identified as Simpson's girlfriend, signed for the package, Gregory said.

A search of the home, to which Simpson consented, revealed six more pounds of marijuana along with scales, boxes and packaging materials consistent with a distribution operation, Gregory said.

Simpson and a teammate who was at his house, offensive tackle Anthony Collins, were questioned and released, Gregory said.

Charges in the case are expected to be filed this week, she said, but it was unclear Thursday where those charges would be filed. Whether the charges are state or federal, they will likely be felony charges, Gregory said.

The Kenton County, Kentucky, prosecutor's office said Thursday it had no comment on the case.

Calls to Simpson's home on Thursday were hung up on.

Bengals public relations director Jack Brennan said the situation is fluid but would not make further comment.

Simpson is a fourth-year wide receiver from North Carolina. He has started both the Bengals' games this season, grabbing eight passes for 180 yards.

Collins is a fourth-year linebacker from Texas who has played mostly special teams this year, according to the Bengals' website.