By Jacqueline - / Sunday 1 July 2012 20:01 / United Kingdom
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  brt3420  |  13

I work for a security alarm company and I deal with the equipment all day, it was most likely a glass break sensor. Older equipment suck and are easily triggered.

  kyleekay  |  25

I don't think the pebbles scratching the window is what set off the alarm. I think the fact that the window was being pelted with objects is what set it off. A bouncy ball would likely have the same effect.

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