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Allegedly retaliating to government's decision to hang terror convicts, the miscreants - riding motorbikes – threatened the residents and school staff early morning.
The assailants also left a threat letter before escaping from the scene.
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No casualties were reported as schoolchildren were not present at the institution.
Muttahida Qaumi Movement (MQM) Rabita Committee condemned the grenade attack and criticised the government for failing to take effective security measures in the city.
Police and Rangers were also deployed in the area soon after the incident and Director-General (DG) Rangers Bilal Akbar also visited the site of the attack.
Further, Chief Minister Sindh Qaim Ali Shah took notice of the incident and sought a report from the inspector general in this regard.
Meanwhile, three people were also injured in a grenade attack in Karachi’s SITE area.
Police cordoned off the area soon after the attack that essentially targeted Rangers.
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