A evaluate is beneath method after a futuristic Christmas celebration in Perth went mistaken when 50 drones, price roughly $100,000, plunged into the Swan River.
The Metropolis of Perth blamed '"technical points" for the mishap on the metropolis's Summer time Nights Metropolis of Lights occasion on Sunday evening.
As drones drew vibrant festive scenes within the sky, some began dropping to the earth.
Roughly 50 of the five hundred plane, every costing about $2000 in response to the drone firm, dropped into the river.
Metropolis of Perth lord mayor Basil Zempilas admitted "a number of the drones weren't doing what they have been alleged to" however mentioned there was no danger to the general public.
"I settle for that the drone present on Sunday evening fell wanting expectations," he mentioned.
"That was due to some technical points."
He mentioned Civil Aviation Security Authority security protocols have been noticed and no person was at risk.
"The drones that fell fell into the river and nowhere close to folks," he mentioned.
"There's a cause why there's such a strict enforcement of the security zone round this know-how.
"Issues can go mistaken with know-how of this sort."
A evaluate is underway into what occurred, and the lacking drones might be retrieved from the river.
Drone Sky Present managing director Joshua Van Ross mentioned every drone price about $2000, making the mishap price round $100,000.
"This know-how remains to be evolving," he mentioned.
"I did cry slightly bit final evening, I'm attempting not to consider it. It was an costly present for us."
He mentioned wind may cause issues to go mistaken, and it's regular for two-to-three drones to not work correctly.
He mentioned they have been wanting into what had gone mistaken.
Computerised drones have gotten an alternative choice to fireworks.
The present aimed to inform the story of a 'Christmas within the Metropolis', and is a part of six deliberate over the summer season, to "wow the folks of Perth," the Council says on its web site.