On November 5th, 2015, Bento Rodrigues, Brazil, was inundated in toxic sludge after a mine dam burst. See here for the full story as well as some ground level photos showing the magnitude of the disaster. More here, including a video.
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The dam that collapsed.
The area near the dam.
Over 40 km downstream the town of Barra Longa was affected too.
To see the above locations in Google Earth and to explore further download this KML file.