The lead singer of the rock group Puddle of Mudd was arrested after throwing a bottle and spitting at fans during a concert, authorities said. The band was just 15 minutes into its show Sunday when lead singer Wesley Scantlin threw the bottle into the crowd of more than 1,000 people, authorities said. Undercover state liquor agents decided to arrest him, said Earl Mack, an agent with the Ohio Department of Public Safety’s investigative unit. “We thought we were going to have a riot based on this guy’s conduct,” Mack said. “It could have been a lot worse.” Authorities said Scantlin was drunk and that he was spitting inside the police car. Scantlin, 31, of Beverly Hills, Calif., was charged with disorderly conduct intoxication, misconduct involving a public transportation system and criminal mischief. All are misdemeanors. He was released Monday after posting $150 bond. Tiffany Youhanna, tour publicist, said the band’s management would not comment. Puddle of Mudd was nominated for best new artist in the American Music Awards two years ago. The band released its second album “Life on Display” in November. The single “Away from Me,” spent two months atop the rock radio charts.