SURRY, Va. -- Federal authorities have filed court documents outlining an alleged dogfighting operation at a property owned by Atlanta Falcons quarterback Michael Vick.

Vick was not named in the documents.

The documents filed in U.S. District Court in Richmond and obtained Friday by The Associated Press contain the address of the home that has been the center of the investigation.

According to the documents, dogfights have been sponsored by "Bad Newz Kennels" at the property since at least 2002. For the events, participants and dogs traveled from South Carolina, North Carolina, Maryland, New York, Texas and other states.

Members of the venture also knowingly transported, delivered and received dogs for animal fighting, the documents state.

Authorities conducted a second federal raid Friday on a property owned by Vick in Surry, Va.

A Virginia television station said that investigators were digging in an area behind the house in a search for animal carcasses.

During an April 25 drug raid at the property, authorities seized 66 dogs, including 55 pit bulls, and equipment commonly used in dogfighting. About half the dogs were tethered to car axles with heavy chains that allowed the dogs to get close to each other, but not to have contact, an arrangement typical for fighting dogs, according to the search warrant affidavit.

Investigators seized a "rape stand," used to hold dogs in place for mating; an electric treadmill modified for dogs; a pry bar used to open the clamped mouths of dogs; and a bloodied piece of carpeting.

In late May, federal agents obtained a search warrant based on information that there were as many as 30 dog carcasses buried on the property. But the warrant was never executed because prosecutor Gerald G. Poindexter questioned the way it was worded.

Vick, who is in the process of selling the property, said he rarely visits the home and was unaware of any crime that might have been taking place there. His cousin, Davon Boddie, was living in the house at the time of the raids.