Probably no one if there wasn't a fire. Years ago I lived across, in a semi-detached house and the permanently angry neighbour next door, with 3 young kids, was so sick of his alarms going off phantom, either with steam from the shower or burning the toast, in a fit of pique one day he went around the house and smashed all the detector heads off with a shoe leaving him, his kids and us without protection. All because he was ignorant of their operation and how to access and change the battery. There was no-one to complain to about that. Eventually, we came to blows over it and the cops wanted to do me for assault! Didn't matter the danger he put everyone in. I moved out in the end.