At the Baikonur Cosmodrome in Kazakhstan a Proton-M rocket with DM-03 upper stage, carrying three Russian Glonass-M navigation satellites went out of control, exploded and crashed at 8:38 AM local time, July 2 2013.
The rocket propellant used is the hypergolic oxidizer dinitrogen tetroxide with the toxic and carcinogenic fuel unsymmetrical dimethylhydrazine, which leads to the brown smoke, massive fireball, and inevitable environmental contamination during the crash.
Edmund Duke translated the audio and posted it in the comments, thanks!
“…nav system GLONASS. According to plan it will happen four hours after the start… So here’s start… What a sight… But looks like something goes wrong! Something is wrong! Looks like it’s going to be a catastrophe… So, rocket heads on to the ground and falls into pieces, and explosion… So, it was a live broadcasting of an unsuccesful launch of rocket Proton-M with three satellites of Russian navigation system GLONASS abroad. Volumes of black smoke soar up into the air…”