VANCOUVER, British Columbia &#8212 A hot air balloon burst into flames over western Canada, burning a woman and her adult daughter to death while their families looked on, officials said Saturday. Other passengers leaped to the ground, some with their clothes in flames, witnesses said.

Eleven passengers were seriously injured when the balloon crashed Friday evening in a recreational vehicle park near the U.S border in Surrey, British Columbia, a suburb of Vancouver. There were 12 passengers and a pilot on board, police and witnesses said.

John Kageorge, who works for Fantasy Balloon Charters, said the fire started as the balloon was about to launch. Kageorge said three passengers did not get out of the basket before it became airborne.

“One person jumped from an unsafe distance, two stories in the air or more,” said Kageorge. The mother and daughter did not jump, he said, although two of their family members made it out of the basket.

Royal Canadian Mounted Police Sgt. Roger Morrow confirmed the deaths and said relatives of the two passengers killed witnessed the fire.

“It’s just tragic. They watched it unfold before their eyes,” Morrow said of the family. “The fatalities suffered from burns.”

The balloon caught fire as it launched, said Bill Yearwood, an investigator with the Transportation Safety Board of Canada.

After most of the passengers escaped, the balloon exploded in a fireball and shot up into the air. Shortly after, the burning balloon plunged to ground in the RV park, leaving a tail of thick black smoke in its wake.

“The thing went up about 400 feet in the air at which point it melted enough of the balloon – it collapsed,” said Don Randall, a resident of the trailer park who took pictures of the scene. “The basket was basically a fireball. It just dropped like a stone,” he added.

Smoke could be seen billowing from the crash site from miles away.

The cause of the accident was not immediately known. Weather conditions were clear at the time of the sunset flight.

Perry Kendall said he saw what looked like something out of a movie.

“It was horrifying,” said a shaken Kendall. “Just looking at people screaming and jumping out of there. Some of them, I think, had fire on their clothes. It was just awful.”

Witnesses also said propane tanks from the balloon shot off and landed on the Hazelmere RV park below, setting fire to three trailers and several vehicles.

“We’re exceptionally lucky that nobody in any of these three trailers or in the vehicles that were destroyed were caught in them,” Morrow said.

The hot-air balloon, operated by Fantasy Balloons Charters based in Langley, British Columbia, was one of several balloons in flight at the time. The balloon that burned, Kageorge said, was about nine stories high.

There was a similar accident earlier this month in the central Canadian province of Manitoba, Manitoba, where 12 people were injured.