TARPON SPRINGS - Well-wishers of Phil the injured pig Friday increased the reward offered for tips leading to his attackers from $2,500 to $8,000. The Humane Society of the United States announced it is offering a $2,500 reward. The Humane Society of North Pinellas is offering $3,000 reward donated by private citizens. People for the Ethical Treatment of Animals, a Virginia-based animal rights group, said Thursday it is offering a $2,500 reward. Phil was bludgeoned late Tuesday or early Wednesday in the Tarpon Springs High School field where he lives. The pig, which is part of the school's Agriscience Academy, is recuperating at the Humane Society of North Pinellas. Plans for his adoption are under way. Pinellas County sheriff's officials said they have no suspects.