Iron Maiden's manager claims the riot that caused his band to leave the Ozzfest tour this past weekend was a "premeditated and co-ordinated attack," NME.com reports.

During Iron Maiden's set in San Bernardino, Calif. on Saturday, the British band was pelted with eggs, had their sound cut and saw an audience member run onstage with an American flag.

Following the performance, a statement on the Ozzfest Web site accused singer Bruce Dickinson of "berating Ozzy and belittling the Ozzfest audience" and being "the only person who hasn't had the Ozzfest spirit."

Manager Rod Smallwood said he knew who sabotaged the band's set and said he was "immensely proud of Maiden who stood up to it all."

"Those who participated or stood idly by and watched as this all went down should also be ashamed of themselves," said Smallwood. "I do think the band deserve an apology from a number of people, and you know who you are."