French TV report with more images
https://www.youtube.com/watch?v=7iwNGiGEC4o
27/08/2017 Canadair CL-415 / F-ZBFN / Plane accident / Rhône river, port of Vallabregues, France
Page has other links including
https://aviation-safety.net/wikibase/wiki.php?id=199266
Apparently a formation take off resulting in one of the aircraft striking and dis-masting a barge that was tied up to a dock. There were people on the shore nearby. The river Rhone seems to be up to 200 meters wide in that area but not very straight. Formation take off perhaps unwise?
"The wing of the Fire-fighting plane is damaged, it will be unavailable for several weeks"
No injuries.
Very, very close to disaster.