Washington (CNN) - President Barack Obama said Friday that flags at the White House and other federal buildings will be flown at half staff until Veterans Day in recognition of the shooting at Fort Hood, Texas.
"This is a modest tribute to those who lost their lives even as many were preparing to risk their lives for their country," he said at the White House.
"It's also a recognition of the men and women who put their lives on the line every day to protect our safety and uphold our values."
Obama said he met Friday morning with FBI Director Robert Mueller and other federal agency heads to discuss the ongoing investigation into the massacre.
"We don't know all of the answers yet, and I would caution against jumping to conclusions until we have all of the facts," he said.
The alleged shooter, Maj. Nidal Malik Hasan, a psychiatrist who worked in a hospital at Fort Hood, is blamed for the deaths of 12 soldiers and one civilian, military officials said.
Another 30 people were wounded; 28 of them required hospitalization.