A dark cloud continues to follow R&B singer Akon. Three workers were hurt when part of an outdoor stage set being built for the singer at Emory University in Atlanta collapsed Thursday afternoon. No students were injured, but Dekalb County officials said two workers were taken to a local hospital with serious, potentially life-threatening injuries. The concert was subsequently canceled.

In April, Akon, who opened for Gwen Stefani on the Sweet Escape Tour, stirred up controversy when he simulated a sex act with a 14-year-old girl during a show in Trinidad and Tobago. Akon insisted he wasn't at fault because the club claimed to have an 18-years and over age limit.

The singer later apologized for the incident on the song, 'Sorry, Blame It On Me,' which was released on iTunes and Akon's MySpace page. Prior to the release of the apology track, Akon was filmed lifting a fan onto his shoulders and tossing him into the crowd during a performance in Fishkill, NY. Fishkill authorities are still investigating that incident.

There is no word if the Emory University concert will be rescheduled.