A driver claims human faeces fell through her sunroof from a plane flying overhead and landed on her face, leaving her with an eye infection.

Susan Allan had been driving in her hometown of Kelowona in British Columbia, Canada, with her son Travis when she stopped the vehicle at a red light.

But then the pair say they felt a liquid, smelly substance come in through the sunroof. Ms Allan says that she was hit in the face and her son on the shoulder.

She immediately went to a car wash and cleaned herself up but the next day had to visit a doctor after her eye swelled to the size of a 'golf ball'.

Ms Allan says she is speaking out as she claims the authorities were not sympathetic when she told them about the incident.

She told the Canadian Press: 'I just want everybody to know that although this seems like a surreal type of story, this happened to me and my son.

'All we want people to know is that it was quite devastating to be covered in poop and I hope it never happens to anybody else.'

And she told Globalnews.ca: 'My car was inundated with poo. I would like them to clean my car out. An apology would be nice, and I do believe they owe me some compensation for my eye.'

Both the nearby Kelowona Airport and Transport Canada have confirmed they are investigating the incident.

People regularly report having human waste fall on them from aircraft.

Sewage on planes is actually kept in a tank and can only be emptied using an exterior lever.

But it is possible for leaks from the tanks to occur and the waste to slide out and freeze on the side of the aircraft.

As the plane descends into a lower altitude, where the air is warmer, the frozen waste can melt and fall off.