Geno Martini, the mayor of Sparks, Nev., cancels a motorcycle event and declares a state of emergency after the fatal shooting of Jeffrey Pettigrew, 51, during a casino melee.The fatal shooting of a California Hells Angels leader during a casino melee with a rival gang Friday night has prompted the mayor of Sparks, Nev., to declare a state of emergency and cancel an annual motorcycle event, authorities said.