HUMAN poo has been mysteriously falling from the sky across Canada - leaving people, cars and property covered in faeces.

The bizarre phenomenon was first reported in Kelowna, British Columbia, when a mum and son say they were covered in "liquid poo falling from the sky".

4 Susan Allan took pictures of her car in what she claims was human waste that fell from a plane Credit: Globalnews.ca

It might sound like a freak one off but it's happened on 17 separate occasions since that initial poo shower on May 9, according to IFL Science.

Three days after Susan Allan and her son Travis were splashed with sewage, a man in the same town walked out to his driveway to find his car covered in the stuff.

In a more recent instance, a family were sitting on their deck in Yellowknife - 1,800miles away - when they were showered in a "black liquid".

Linda Smith told CBC News: "It was like somebody's septic tank burst. It was really bad.”

4 Susan claims she was covered in 'liquid poo falling from the sky' through her open sunroof from a passing plane Credit: Globalnews.ca

4 She said she was covered in the liquid and suffered an eye infection Credit: Globalnews.ca

One theory is that it's due to overhead planes dumping their load, known as "blue ice" which is named after the colour of the toilet disinfectant used on flights.

Aeroplanes toilets aren't supposed to emptied in the skies due to health risks - but accidents do happen.

Transport Canada spokesperson Pierre Manoni told CBC: "If this happens, the liquid seeping from valves freezes and adheres to the outside of the aircraft when the aircraft is flying at high altitudes.

"As the aircraft starts its [descent] and the atmosphere gets warmer, the ice will start to melt and pieces will detach themselves from the aircraft.

Cloudy with a chance of feces: Yellowknife family says poop fell from sky https://t.co/pG1bpuy8nJ pic.twitter.com/LCpsIhhY0L — CBC Canadian News (@CBCCanada) June 28, 2018

"These pieces of ice will either melt or remain in their solid state before hitting the ground."

Transport Canada said it has received 18 reports of people or their vehicles being struck by "a substance" from above, Vice reports.

But in a weird twist, the government department later said it has investigated all of the reports and none of them were aviation-related.

In a statement, an unnamed spokesperson told Vice: “The department’s review has concluded that these incidents do not meet the description of blue ice and are therefore not aviation-related."

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But Susan has refused to accept the government's response and told the website she believes "this is a cover up".

She told Vice she is hiring a private investigator after spending time researching flight patterns and speaking to over victims on social media.

Another theory being thrown out there comes from a retired captain, who reckons it could be coming from Canadian geese.

4 One theory was that it could be 'blue ice' from overhead planes - but Transport Canada has ruled it out Credit: Globalnews.ca

Ross Aimer, former chief executive of Aero Consulting Experts, told CBC: "Canadian geese, that we all know very well, have a migrating pattern where the scientists know exactly when and where they migrate.

"These birds could be literally hundreds of miles away when they poo and that could be carried onto, unfortunately, Linda's backyard.

"Especially when she said it was black. That could be bird excrement."

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