Justin Bieber attacked on stage by fan

Singer Justin Bieber was attacked by a fan at his show here but security guards intervened and prevented the incident from disrupting the event.

The incident took place Sunday night when the 19-year-old pop star was performing one of his last songs, "Believe".

"A man ran on stage during 'Believe' and tried to grab Bieber and knocked the piano over," a source close to the singer told usmagazine.com.

"He was a fan. Security detained the young man. All was fine and Bieber continued the show," he added.