The Strokes have been known for their hard-partying ways over the last twenty years or so, but it seems like their frontman Julian Casablancas may have overdone it at the weekend.

The New York band - and specifically Casablancas - came in for heavy criticism by fans after their performance at Danish festival Roskilde.

Not only were they 30 minutes late taking the stage for their headline slot, but Casablancas' behaviour was 'erratic', according to some audience members.

One described him as "stiffer than a student on a wagon ride", while another said “everyone [at] Roskilde wants what The Strokes have taken”, while another claimed (via Reddit), "This was absolutely bizarre. People were pumped for the show but Julian was completely off the rails."

Several fans also noted the frontman's rambling between-song banter and stories, including talking for several minutes about his confusion about the Danish word for 'cream', as well as a long intro for their song 'Last Nite' that lasted over two minutes and saw him ranting about the concept of encores.

However, Casablancas defended himself in a now-deleted social media post, denying that he was under the influence during the set. "I’m not tuned into Twitter things enough to know what some confused fan thinks or pretends they know,” the post read., "but I'm fine… far as I know … people been asking me weiiird questionnns – ahh the dumb side of social media… Lame-Os running around so hard and free."

He added: "PS the concerns and questions are kind and fine! it’s the strangers announcing /acting like they know some shit that’s dumb. (weird questions not the dumb side haha)."

See clips from their set below: