Why do security forces hang glass bottles on barbed-wire fences along the India-Pakistan border?

Empty glass bottles are strategically hung on barbed-wire fences along the India-Pakistan border, creating a simple yet effective noise alert system. These clinking bottles warn of intruders, smugglers, or wildlife, especially in areas with poor visibility, supplementing advanced security measures with a low-cost, low-maintenance solution.

Why do security forces hang glass bottles on barbed-wire fences along the India-Pakistan border?
Empty glass bottles are strategically hung on barbed-wire fences along the India-Pakistan border, creating a simple yet effective noise alert system. These clinking bottles warn of intruders, smugglers, or wildlife, especially in areas with poor visibility, supplementing advanced security measures with a low-cost, low-maintenance solution.