***UPDATE*** The Associated Press reveals more details about the shooter:
The suspect had been disarmed after an earlier incident at the center but returned with another weapon, according to a senior military official in Washington, who spoke on condition of anonymity because the investigation into the shootings was ongoing.
***UPDATE*** The American soldier who shot dead five fellow soldiers at a U.S. base in Baghdad is in custody.
"The shooter is a US soldier and he is in custody," US marine corps lieutenant Tom Garnett, a US military spokesman in Iraq, told reporters.
The New York Times adds some perspective to the tragedy:
The killings appeared to be the worst case of soldier-on-soldier violence among the American forces based in Iraq since the invasion more than six years ago.
The shootings, which took place at a stress clinic, highlight the problem of post-traumatic stress disorder among U.S. soldiers, notes the Guardian:
Stress is one of the biggest killers of US soldiers in Iraq. About a fifth of all US troops are thought to be suffering from post-traumatic stress disorder, contributing to high divorce and suicide rates. An estimated one fifth of the 4,292 members of the US force in Iraq have died from non-combat causes, either in accidents or from suicide.
***UPDATE*** According to Fox News, White House press secretary Robert Gibbs Monday relayed President Obama's response to the tragedy. Obama expressed shock and sadness and is promising to fully investigate what exactly transpired at Camp Liberty, so as to prevent such incidents in the future.
***UPDATE*** AP has another update. The shooting was at a 'stress clinic':
Pentagon officials say five Americans are dead after a U.S. soldier opened fire at a U.S. base in Baghdad. They say the attacker is in custody.
The officials say the shootings happened on Camp Liberty at a stress clinic, where troops can go for help with the stresses of combat or stress from personal issues.
One senior military official in Washington says it's unclear whether those killed are workers at the clinic or were there for counseling. He says officials also are unsure whether all the dead are members of the military.
***UPDATE*** ABC News reports that the U.S. soldier who attacked fellow troops on a U.S, base in Iraq has killed five of them and is now in custody. Initial reports suggested that he had turned the gun on himself after his rampage.
***UPDATE*** AP now reports that the U.S. soldier who went on a rampage against his fellow troops in Iraq may have survived the incident:
Pentagon officials say five U.S. soldiers are dead after an American soldier opened fire at a U.S. base in Baghdad.
The officials say the shootings happened Monday at Camp Liberty near Baghdad's airport.
One senior military official in Washington said it was not yet clear whether the shooter was among the dead. The official spoke on condition of anonymity because the circumstances surrounding the deaths are under investigation.
Initial reports indicated the Army soldier shot several others, then turned the gun on himself. But it was unclear whether he, too, had died.
***UPDATE*** CNN reports that 3 other U.S. soldiers were wounded during the friendly fire incident that has left 5 U.S. troops dead. An American soldier killed 4 of his fellow troops before killing himself.
According to the Washington Post, it is the single greatest loss of life in a single incident involving U.S. soldiers since a truck bomb last month took the lives of 5 American soldiers.
***UPDATE*** CNN has just sent out a breaking news alert reporting that senior defense officials have told the network that a US soldier killed 4 of his fellow troops before killing himself. Check back for more information.
McClatchy is reporting that a shooting at a U.S. base in Baghdad has left 5 soldiers dead. The shooting occurred at Camp Liberty, a base near the Baghdad airport.
Check back for more information.