Washington - President Barack Obama (web | news | bio) will attend a memorial service for those killed at Thursday's mass shooting at Fort Hood, Texas.White House spokesman Robert Gibbs on Friday said a service will be scheduled at the convenience of the families who lost loved ones during one of the largest mass shooting on a military base. Gibbs says a service has not yet been scheduled and it would be planned around the families' schedules, not the president's.

Thirteen people were killed and 30 others injured in the shooting rampage at the Texas Army post on Thursday. The suspected shooter is an Army psychiatrist; his motive remains unclear.

Gibbs said that a memorial service is keeping Obama's schedule next week in flux.

Obama is scheduled to leave for Asia on Wednesday but wants to attend a memorial before starting the 10-day trip. Gibbs says the White House would not rule out delaying the trip because of the service.

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