Afghan President Hamid Karzai has condemned the bloody attack on the Chinese workers as an act of Afghanistan's enemies, a press released issued said on Friday in Kabul.

"This attack is the work of the enemies of Afghanistan who want to derail the process of national reconstruction in Afghanistan and this will not be tolerated," President Karzai stressed in the handout.

As a result of a cold-blooded attack committed by some six armed men early Thursday morning on Chinese workers' compound in northern Kunduz province, 11 workers were killed and four others were injured.

"On behalf of the people and government of Afghanistan, I would like to present my deepest condolences and sympathy to the families of the victims, the Chinese people and government," Karzai said in the press release Friday morning.

The Afghan President who is on an eight-day tour to the United States, added in the release that Afghanistan is grateful to the Chinese people for the assistance and contribution to its reconstruction.

At the President's order, a special investigation has been launched to bring those responsible to justice.

Afghan Acting President and Defense Minister Mohammad Qasim Fahim also condemned the terrorist incident and constituted a delegation to visit the site and initiate a thorough investigation into the bloody issue on Thursday.