"A man ran on stage during 'Believe' and tried to grab Justin and knocked the piano over," a source close to Bieber told Us Weekly. "He was a fan. Security detained the young man. All was fine and Justin continued the show."
According to The National, the young fan was wearing a white shirt and jeans when he rushed on stage to disrupt the show. After three minutes, the 19-year-old pop star continued playing as if nothing happened.
Tech investor Chris Sacca also captured Vine video of the subsequent "mayhem":