It seems it was a rope-way, due there are no power lines in that zone.
Edit From Eurocopter SIN
EUROCOPTER informs you of an accident involving a military type COUGAR helicopter. The accident occurred in France on Wednesday 25th of July, 2012. The AS532 AL helicopter was performing a final verification flight before delivery. There were 6 EUROCOPTER employees aboard the helicopter who did not survive the accident. Initial findings made at the site of the accident indicate that the helicopter might have struck an electric line. The investigation is ongoing. It is headed by the BEAD (Air Defense Accident Investigation Board).
thet hit a power line, yes This line is across the river since at least 20 years, may be more I have lost 3 friends in that crash! RIP Patrick, Jean Louis and Gerard. Of course the same for the 3 i did not work whith before!