Karachi- Following the Karachi airport attack last Sunday, different security agencies conducted raids in various areas of the metropolis and rounded up at least a dozen Uzbek nationals on Saturday night. According to sources, police, the rangers and intelligence agencies undertook raids in different areas of the mega city including Gadap, Manghopir, Sohrab Goth and Kunwari Colony and nailed over dozen Uzbeks. It should be mentioned here that the law-enforcement agencies were ordered from the top command to speed up the action against the conspirators in Karachi airport attack. Meantime, the law-enforcers have been put on high alert in view of the precarious situation. The security has further been heightened at all the entrances and exits of the metropolis. The procedure of security checks has been expedited across the city.