The official story is basically "so we attached this glock to a roomba and it turns out when it shoots it can damage this playpen we stuck it in for testing. We just left it unattended for a few weeks, for reasons, and when we checked in it turned out it had been roving all around town! How crazy is that, total machine uprising stuff, our handgun-armed roombas are super cool and advanced like that!"

Like I'm honestly not sure what the truth of what happened is. Because they're 100% overselling whatever happened, but the core of "we made a machine that creates text that breaks computers, and it made text that broke open its sandbox and let it send the text that breaks computers to remote servers until it found one that broke in the right way and let it try to continue its testing goals" is a plausible thing that could happen just as an accidental side effect of making a machine that spits out text that breaks computers and leaving it unattended. They try to sell this as some super scary intelligence capability that means it's smart and planning and shit, when its inability to remain within its guardrails is evidence of the opposite. It's a firework flying off in a random, whirling pattern towards a crowd when it should be not doing that if it was working correctly.

But the people who gave even that explanation are constantly lying about everything so it's also plausible that they just let the proverbial armed roomba loose on the street themselves to drum up hype for their armed roomba program, because they know consequences aren't a thing that can happen to them personally so why not go wild with it.