The White House says President Barack Obama will attend a memorial service on Sunday for the victims of the mass shooting at the Washington Navy Yard.

The U.S. flag is shown lowered to half-staff at the White House (Olivier Douliery-Pool/Getty Images)

White House spokesman Jay Carney says Obama wants to mourn the loss of the victims in Monday's massacre and share in the nation's pain in the aftermath of another mass shooting.

Details about where and when the memorial will take place have not been announced.

A dozen people were killed in the shooting. The shooter, Aaron Alexis, was also killed.

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