Aid group: Fighters not thieves killed 10 workers‎ - The Associated Press

It appears from accounts of survivors that the gunmen came from the Barg-e-Matal district of Nuristan which is closer to the Pakistani border. Insurgent infiltration has increased in that area since the U.S. abandoned small combat outposts that proved too difficult to defend and resupply.

Safiullah told investigators he believes the lead gunman was Pakistani because he yelled "Jadee! Jadee!" — a word used in several regional languages that means "hurry up." It is more commonly used in Pakistan and India than Afghanistan. He said all the attackers understood Dari and Pashto, the two main languages spoken in Afghanistan, but conversed in Pashaye, a local dialect used only in parts of the northeast corner of Afghanistan. -- Aid group: Fighters not thieves killed 10 workers‎
Foreigners boost insurgency in eastern Afghanistan‎