The shooting occurred at 2 p.m. at a stress clinic at Camp Liberty, near Baghdad International Airport, two senior defense officials said. Though initial reports indicated the attacker was killed in the incident, the U.S. command in Baghdad said late Monday a suspect in the killings was in custody.
Neither the suspect nor any of the victims had been identified, but a defense official with access to the latest reports on the incident told CNN that the suspect had been a patient at the treatment center.
"Any time we lose one of our own, it affects us all," Col. John Robinson, a U.S. military spokesman, said in a written statement. "Our hearts go out to the families and friends of all the service members involved in this terrible tragedy."
In Washington, the White House said President Obama was "shocked" by the attack.
"The president's heart goes out to the families and friends of all the service members involved in this horrible tragedy," White House spokesman Robert Gibbs told reporters. "He was shocked by the news of this incident and will press to ensure that we fully understand what happened at the clinic, and that we are doing everything we can to ensure that our men and women in uniform are protected."
The president planned to bring up the issue in a meeting with Defense Secretary Robert Gates, Gibbs said. And Gates expressed his own "horror and deep regret" Monday afternoon.
"We are still in the process of gathering information on exactly what happened," Gates said. "But if the preliminary reports are confirmed, such a tragic loss of life at the hands of our own forces is a cause for great and urgent concern. And I can assure you that it will get this department's highest priority attention."
Camp Liberty is tightly guarded, and U.S. troops are required to clear their weapons of ammunition while on the base. The only service members who have loaded weapons are those guarding high-ranking officers and military police.
Monday's attack marks the sixth incident in which a service member was killed by a fellow service member since the launch of Operation Iraqi Freedom, the March 2003 invasion of Iraq.
My comment
It's quite madness. The war seems to go to a nonsense situation. There might be many stressful and depressed soldiers like him in Iraq. The war is merely lasting too long but not make any benefit for the people in Iraq or U.S.