The 40-city tour was scheduled to run through November 28. No specific reason was given for the cancellation, but it’s not hard to imagine how the tour derailed.

A member of rapper Jay Z’s entourage released pepper spray at R. Kelly during a joint concert at Madison Square Garden, Kelly’s publicist said.

The spraying happened about an hour into Friday night’s show, when Kelly walked onstage and said he saw two people in the audience waving guns, publicist Allan Mayer said. Kelly abruptly stopped his set around 9:30 p.m. while MSG security employees searched for weapons.

Finding none, guards told Kelly it was safe to continue performing, Mayer said. But as the singer was making his way back to the stage, a man in Jay Z’s entourage – apparently miffed that Kelly interrupted the show – sprayed him and two of his bodyguards in the face.

“I’m pretty sure Jay didn’t realize what was going on,” Mayer said in a phone interview.

All three men were treated at St. Vincent’s Hospital and released, Mayer said.

Jay Z performed for another 45 minutes after Kelly was sprayed, Mayer said.

In a radio interview on Hot 97 FM radio Friday, Jay Z said he couldn’t understand why Kelly left the stage.