Biffy Clyro's set at Britain's Glastonbury festival on Saturday (26Jun10) was marred by injury when singer Simon Neil hurt his leg after jumping off a speaker.
The trio, comprising of Neil, James Johnston and Ben Johnston, were surprise guests on The Park Stage and drew a huge crowd as news of their appearance spread.
But the frontman was left with a nasty injury when a stage stunt went wrong, according to NME.com.
A spokesperson for the band has confirmed the injury is not as bad as first thought, with many fearing the star had broken his leg, telling the website the singer has "ruined his knee".