Before playing a sold out show to 50,000 fans at the Rogers Centre in Toronto Friday night, Guns N' Roses were detained at the Canadian border, because someone with the band had a firearm. 

Axl Rose jested about the whole thing before launching into the band's 18th song of the evening, telling the audience "we weren’t exactly arrested, we were detained.” He put an extra inflection on the detained part, explaining that the Canadian customs agents were "very nice." Watch the clip above. 

Billboard called up the band's reps, who confirmed the story: "Yes, this indeed happened on Friday, July 15, as they were crossing the border coming from the Philadelphia tour stop on the 14th,” said the rep, who noted that the gun didn't belong to any member of GNR. 

Meanwhile, the band continues its Not In This Lifetime Tour—which has featured the unseemly Skrillex as an opening act—through November. 

Next up, check out GNR guitarist Slash talk about the band's rowdy old days: