Initial reports suggest that the deceased, identified as Syed Hubdar Hussain Shah, 52, was a constable of the Intelligence Bureau.
Assailants hurl grenade at imambargah
Police said two assailants riding a motorcycle opened fire on a group of people, who were leaving the imambargah after offering Maghrabain prayers.
The injured men, Inayat, 62, Ain Zaidi, 73, and Nadeem Hussain, 42, were admitted to the Pakistan Institute of Medical Sciences (Pims).
Pims administrator Dr Altaf told The Express Tribune that two of the injured men were in a critical condition. They all suffered bullet wounds.
The police have registered an FIR against the unidentified attackers.
Police sources said a Kalashnikov was used in the attack.
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