Informants have come forward saying they can link Atlanta Falcons quarterback Michael Vick to dog fighting, the prosecutor in the case said Thursday, and he has turned their accounts and contact information over to investigators. Surry County Commonwealth's Attorney Gerald G. Poindexter said he has heard from about a half-dozen people claiming to have information about Vick's involvement in dog fighting, but he does not know if their claims have proven to be reliable. In a letter, an inmate in a South Carolina prison claimed that he attended dog fights where Vick also was in attendance and saw Vick bet large amounts of money. Another informant provided street names of dog fighters from elsewhere in Virginia.