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I’m not sure why you are confused about minors being injured in a nightclub explosion? The guardian article doesn’t explain much, and I don’t know this place in Perú, but if it’s anything like where I grew up in Argentina then you would not be surprised. I’ll presume your background must be very different so I’ll share what mine was like.

I would go nightclubbing too at that age, not too frequently since I’m not much of a party person. You are not supposed to be let inside if you are underage but the bouncers usually don’t care and judge more on appearances (how well dressed you are, how childlike you look) than actual age. You look hot, and older than 15? In. Your dressing doesn’t conform to the club standards, irrelevant of age? Bounced. You look 15 years old or younger? You need to show ID, if you are younger than 18 you get bounced.

Also, at least where I lived, nightclubs were allowed to let underaged before midnight, under the condition that no alcohol was sold to them before midnight and also, that they had to purge everyone out by then. To keep the pedos at bay there was an age cutoff, usually 21 but this also varied and the enforcement also varied. So what usually happens is you get all the teens a couple hours from say 9pm till 12, then everyone is ushered out, they swap the DJ (or, if it’s the same DJ then the music is completely different), then you proceed to let people in for the rest of the night, which usually ran from midnight to 6 or 7 am when everyone is finally kicked out. Minors are supposed to be bounced if they try to go back in, but, I’ve already explained.

Not unusual to see teens who got bounced still hanging out right at the door having a drink or smoking, because, you get the picture.