"I strongly condemn this outrageous act of terrorism against the Russian people at the Domodedovo Airport," Obama said in a statement read by White House press secretary Robert Gibbs to reporters at their daily briefing. "I want to express the solidarity of the American people with the Russian people in the aftermath of this premeditated attack against innocent civilians."
The president said he and first lady Michelle Obama offered their deepest condolences to the Russian people, "who have suffered greatly at the hands of terrorism."
"We share your sorrow and a resolve to stand with you in our common fight against those who use terrorism for their political goals," he said.
A spokesman for Ban said the U.N. leader was appalled by the bombing, calling it a "deplorable and unjustifiable act of violence against innocents."
Ban sent his deepest condolences to the families of the victims and his solidarity with the government and people of Russia.
Gibbs declined to delve into whether Chechen rebels or others were responsible for the attack in Russia that killed at least 35 people and wounded at least 133 others.
"I'm not going to get into -- I don't think it would be a good idea for me to get into that," he said. "Obviously we are continuing to gather facts, to talk with the Russian government.
"We would extend any assistance that they might want, and officials here and throughout our government will stay briefed throughout the day on it."
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