The U.S. ambassador Zalmay Khalilzad apologized for the arrest .
The U.S. ambassador Zalmay Khalilzad stressed that Washington did not mean any disrespect to al - Hakim or his family .
The U.S. ambassador Zalmay Khalilzad apologized for the arrest and stressed that Washington did not mean any disrespect to al - Hakim or his family .