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The search operation, conducted by Rangers in collaboration with area police, lasted for several hours.
During the raid, Rangers officers seized a huge amount of arms, a few motorcycles, a monitor, mobile phones and threatening pamphlets.
One of the pamphlets warned women against visiting marketplaces.
According to initial investigations, the suicide bomber had reached Karachi from North Waziristan yesterday.
Security officers said all the arrested suspects belonged to banned outfits.
Around 1,500 Rangers officers took part in the operation, which was conducted on a tip off.
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