Dropkick Murphys bassist and vocalist Ken Casey has been left bloodied following a fight with an audience member during the band’s St. Patrick’s Day tour.

Ask any fan of the Dropkick Murphys and they’ll tell you that the band’s biggest shows are their annual St. Patrick’s Day performances in their hometown of Boston.

One of the most-anticipated dates on the band’s calendar, it’s understandable that they play these shows with high levels of intensity and passion, meaning that they’re highly unlikely to suffer any fools throughout the gig.

As TMZ reports, this fact became quite clear at the band’s Saturday night show at Boston’s House Of Blues when an intoxicated fan began striking female fans near the front of the stage.

After alerting security to the individual, Billboard reports that Ken Casey was then hit with a beer can thrown by another member of the audience, bloodying his face in the process.

Check out Dropkick Murphys’ concert brawl:

“Ken could see the guy wasn’t going to stop and that security was having a hard time getting to him, so he decided to handle it himself,” a source close to the band explained to Billboard.

“Ken is not afraid to stand up to anyone who is ruining the show for someone else and the band has been clear that they won’t tolerate abusive behavior.”

Footage of the incident shows Ken Casey scuffling with the alleged troublemaker, before security manage to pull him from the crowd an eject him from the venue.

Speaking after the incident, vocalist Al Barr can be seen telling the crowd that this sort of behaviour is relatively par for the course by this point (as evidenced by a stabbing at the band’s 2017 show in Chicago).

“We’ve been doing this for a number of years, and having been here for 21 of those years, I can tell you this is not new,” Barr explained. “When we invite you guys to come to one of our shows, it’s like we’re saying come to our house.”

“And when someone disrespects us, you’re disrespecting us in our house.”

Dropkick Murphys most recently toured Australia back in December as part of the inaugural Good Things Festival. Thankfully, it seems that our local concertgoers were quite well-behaved this time around.

Check out the Dropkick Murphys’ ‘Blood’: