Seven people are in hospital, six with back injuries, after their hot air balloon made a hard landing in Victoria's Yarra Valley.
The hot air balloon left the Glenburn area about 7am on Thursday before landing heavily on a private property in Dixons Creek, near Kinglake, minutes later.
Paramedics assessed 16 people, with seven transported to hospital in a stable condition.
Six of the seven patients suffered back injuries and are aged over 50.
One woman, aged in her 60s, was taken to Box Hill Hospital with suspected ankle fractures.
Those on board were local and international passengers, police say.
Witness Mark told 3AW radio he saw two balloons approaching the ground as he was driving in the area.
"I was driving past that way heading to Wodonga. The (two) balloons were getting closer to the ground," he said.
"The basket was on its side and people were close around it.
"I thought, 'That doesn't look right'."
Flight operator Go Wild Ballooning, which offers balloon rides around the Yarra Valley, Melbourne and Port Phillip Bay, has been contacted for comment.
Other hot air balloon operators have told AAP they did not experience any trouble during their flights or landings this morning and it was normal practice for a basket to be flipped on its side after a flight in order to deflate the balloon.
The Australian Transport Safety Bureau will investigate.