The plan was to destroy the Airbus 321 plane, al Shabab appears to have said, but it failed. The group vowed to continue such attacks.
Secretary of State John Kerry on Saturday sharply criticized Russia for its actions in Ukraine and Syria, accusing Moscow of "repeated aggression" in both places.
"If [Peter] Liang were white, he wouldn't have had an issue...They bully Chinese. It's discrimination."
Art teacher Caitlin Clavette was on her way to school when the tragic accident happened.
Brutally cold air sent temperatures plummeting to "life-threatening" lows Saturday, with millions of Americans warned of dangers including frostbite.