Ray,

I would agree with you - in part that:
the 10 terrorists killed in Karachi Airport Old Terminal Attack, indicated that appeared Uzbeks and Chechens.....It appears that terrorists of all nationalities are finding safe havens in Pakistan and wreaking havoc by biting the hand that feeds!
The Pakistani state for a long time, certainly since 2005, have repeatedly described the "offside" hostile militants as 'foreign militants' - as if there was a clear line within the hostile militants. For that reason I am wary that all the Karachi dead are Uzbeks. There maybe some advantage in stating such attacks are carried out by capable foreigners, so impugning those who are home-grown. Finally the Uzbeks have been in Pakistan for sometime, since 9/11 and IIRC date back to the Soviet era in Afghanistan.