Some thing still appear to be unclear though, especially the fire suppresion agent used. The BBC says it was Freon but this is a refrigeration gas that should have been replaced years ago and is virtually unobtainable now as it is the major contributer to the Antarctic Ozone hole.
Halon is another gas that has now been outlawed for several years as a fire suppresant due to its effects on human health.
Are the Russkies still producing and using these illegal gases?