Rescue crews and firefighters are responding to an explosion and building collapse at the International Nutrition building near 77th and "I" street.  

Interim Fire Chief Bernie Kanger tells Newsradio 1110 KFAB that "some employees are still unaccounted for." He added that there is significant structural damage and that all areas of the facility had not yet been checked.

At least nine people were transported from the scene.

Reaction below from the collaspe from Kari Cook, who told Newsradio 1110 KFAB News her fiance, John Broderick, sent her a text message just before 10 a.m.