By Sam Youngman - 11/06/09 04:59 PM EST
Standing in a chilly but sun-splashed Rose Garden, President Barack ObamaBarack ObamaOur most toxic export: American politick State Dept. insists Brexit won't hurt relations with UK, EU WATCH LIVE: Obama speaks at roundtable with Zuckerberg MORE
ordered the flags that fly at federal buildings to half-staff Friday in
what he called a "modest tribute" to those killed in Thursday's
shootings at Ft. Hood, Texas.
Obama said the tribute is for both 13 killed at Ft. Hood and to honor U.S. servicemen and women who have fallen around the world, as the "whole nation is grieving."
Obama said he met earlier Friday with FBI Director Robert Mueller and other "relevant agencies," but he said he and offiicals do not have all the answers as to what happened when 39-year-old Army Maj. Nidal Malik Hasan "turned his gun on fellow service men and women."
The president cautioned against "jumping to conclusions" as investigators work to find those answers, but he promised Americans that his administration would provide updates.