Some Madonna fans in Colorado have complained after the music superstar used guns during a performance.
A gunman shot dead 20 people during a Batman film at cinema in the state in July.
Madonna started her show last night at the Pepsi Centre in Denver with a gun scene, which she has used in previous performances.
KUSA-TV said today it received several calls from concert-goers saying they were offended she used guns and violence as part of her show in light of recent events.
Madonna and her agent could not be reached for comment.