He's known for his bullish ways on-screen, but now "Harry Potter" star Jamie Waylett has been accused of something strikingly more sinister off the camera - having been arrested for carrying a homemade bomb he allegedly planned to use in the London riots.

According to reports, the 22-year-old was identified as one of the rioters causing civil unrest and property damage that came with last summer's protests in the UK.

“Harry Potter” may be doing well in theaters, but cast member Jamie Waylett could be facing jail time soon, after pleading guilty to growing marijuana plants in his Mother’s home in London.

Waylett, who plays bully Vincent Crabbe in the Potter movies, was caught driving in April with eight bags of weed in his car.