By DECLAN WALSH and ZIA ur-REHMAN
Published: March 28, 2013
KARACHI, Pakistan — This seaside metropolis is no stranger to gangland violence, driven for years by a motley collection of armed groups who battle over money, turf and votes.
But there is a new gang in town. Hundreds of miles from their homeland in the mountainous northwest, Pakistani Taliban fighters have started to flex their muscles more forcefully in parts of this vast city, and they are openly taking ground.
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