Paramilitary servicemen prevent residents from entering an apartment.

Paramilitary servicemen patrol a troubled area of Karachi.

Pedestrians walk past a convoy of paramilitary servicemen on patrol.

Paramilitary servicemen patrol with a sniffer dog.

Paramilitary servicemen patrol a troubled area during a house-to-house search operation.

Men, who paramilitary soldiers said were suspected to be involved in the spread of violence, are detained in a compound while awaiting interrogation.