Police on Monday claimed to have arrested Tehreek-e-Taliban Pakistan's (TTP) Karachi chief, along with three accomplices, all accused of planning a major terrorist.Speaking at a press conference, CCPO Waseem Ahmed and SSP Chaudhry Muhammad Aslam Khan said they had arrested Akhtar Zaman, believed to be the chief of the TTP's Karachi chapter, and three accomplices identified as Samiullah alias Shamim, Fazal Kareem and Munawwar Khan from a Sohrab Goth hideout. "These men had tried to blow up an oil depot in Kemari on September 15," Ahmed said, adding the culprits had planned to target the offices of security agencies using an explosives-laden vehicle.