A U.S. and Canada tour by Kanye West and Lady Gaga has been canceled with no reason given just weeks after the rap star came under public fire for humiliating country star Taylor Swift at an awards ceremony.

Concert promoter Live Nation said in a statement on Thursday that the Fame Kills tour, that was due to kick off in Phoenix, Arizona on November 10 and run through January, had been canceled with refunds available at the point of sale.

West came under fire after an outburst at the MTV Video Music wards when he grabbed the microphone as country teen star Taylor Swift was responding to her best female video award to say that R&B star Beyonce should have won Swift's trophy.

The Grammy winner has since apologized to Swift and expressed regret twice on the Web and in a TV appearance on The Jay Leno Show for his behavior that drew boos from the crowd and prompted a ban of his music by some radio stations in California and Florida.

West told Leno last month that he needed to take time off, saying he hadn't taken enough time to grieve for his mother who died in November 2007.

I need to, after this, take some time off and just analyze how I'm going to make it through the rest of this life, how I'm going to improve, he told Leno last month.