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Last May, when Imran Khan was arrested for the first time after his government's dismissal, his supporters rioted, attacking army cantonments and other symbols of the army's power and prestige.

Mr Khan's arrest in May saw violent protests that also targeted military cantonments.

Thousands of Khan's supporters had rampaged through scores of military installations and vandalized them, including an air base, several cantonments, the house of a general and the army's headquarters.

Mr. Khan’s supporters also tried to enter the city’s military cantonment area, which houses military buildings and residential neighborhoods, but were stopped by the police.

Every year, Ambala, a British colonial-era army cantonment, has typically drawn hundreds of youth into the military with the prospect of lifetime employment.