Fire chiefs have admitted they may never know what caused a huge blaze that engulfed almost two miles of River Tay reed beds.
Fire crews spent nearly 10 hours tackling the inferno, as it spread west through the wetlands.
They were able to contain the damage to a stretch of the riverbed measuring 1.9 miles by 0.6 miles with the aid of Errol helicopter pilot Guy Stephens, who spent hours dumping water on the reeds.
At its height, the flames rose as high as 40ft.
During a virtual meeting of Perth and Kinross Council’s housing and communities committee, a leading firefighter said the cause of the blaze has never been established.
Scottish Fire and Rescue Service group manager Billy McLintoch said: “At this point, there is no real cause for it.
“It’s down at this point as accidental because we can’t actually get to the bottom of where the source was.”
He added: “Thankfully, because it was a protected site around wildlife, we actually got some assistance to bring in a helicopter to extinguish it.
“As I am sure you are aware, the risks out in that reed bed are substantial for any firefighter, so the helicopter was a massive help to resolve that incident and quicker than we probably would have.”
Days after the incident, an expert on the reed beds told The Courier he suspected human involvement in the blaze.
Graham Craig, who had worked on the Carse of Gowrie riverside for decades, said that a fire “wouldn’t just start of its own accord” at the site “even if it was the warmest day of the year”.
He said it may have been started by a person, possibly accidentally.
Mr Craig said the fire-hit section of reeds, the widest in the area, amounted to “10 or possibly 15 years of standing reed there that’s never been touched”.
RPSB Scotland said it would take between a year and 18 months for the habitat to fully recover.
