President Barack Obama took time to address the shootings at the Fort Hood Army base shootings during his visit to Chicago Wednesday.
Several people were killed and injured following the shootings.
Obama was meeting with donors at River North's Chicago Cut Restaurant when he learned of the crisis.
"About three-quarters of the way through the meeting the President was handed a message which none of us knew what it was, but he was obviously very focused on it, very serious," Mesirow Financial's Richard Price said.
The guests had turned in their phones before the meeting began, so they had no idea what had unfolded.
"The whole restaurant became immobolized. The atmosphere in the place became very serious, very anchored, nobody was going anywhere," attorney Robert Clifford said.
Obama addressed reporters from the restaurant following the meeting.
"We're following it closely. The situation is fluid right now ... I want to just assure all of us we are going to get to the bottom of exactly what happened," Obama said. "We're heartbroken something like this might have happened again." (Click here to read full transcript)
Obama was in Chicago for two fundraisers.
Air Force One landed at O'Hare International Airport at 4 p.m. before boarding Marine One for the brief flight to Soldier Field.
From there a motorcade took the president to Chicago Cut for the Democratic National Committee fundraising event. A Democratic official says around 25 supporters attended the roundtable discussion, each contributing up to $32,400.
After the Chicago Cut visit, the President headed to a dinner reception at a private residence in Chicago with approximately 55 people contributing $10,000 each.
The evening DNC event was at the Lincoln Park home of Grace Tsao-Wu and Craig Freedman, two main Obama donors.
The president was scheduled to depart Chicago at about 8:20 p.m. from O'Hare, but he ended up leaving an hour later than anticipated because of the Fort Hood situation.
Obama traveled to his hometown from Michigan where he continued his campaign to raise the minimum wage.