A 41-year-old man and two young girls are dead after a boating accident in Quebec.

Quebec provincial police said a motorboat collided with a personal watercraft just before 6 p.m. Thursday on Lac St-François in the town of St-Zotique, 35 kilometres west of Montreal.

"On the Sea-Doo you had one man and two young girls of around 10 and 12 years old," said police spokeswoman Manon Gaignard.

The three suffered critical injuries and died at the hospital,she said.

Wife and daughter witnessed accident

The man, his daughter and her friend were riding the personal watercraft when it collided with a six-metre-long speedboat carrying five people. None of the people on the speedboat was hurt.

The man's wife and another daughter were following on another personal watercraft, and witnessed the accident.

Martine Chapdelain and her husband were among the first on the scene after the collision. Her husband had been called to the marina because he had taken a lifesaving course.

Chapdelain said she spoke to the speedboat driver.

"The only thing she kept repeating was, `I couldn't avoid them. I didn't see them coming.' "

Chapdelain's husband Mario Rochefort tried to perform cardio-pulmonary resuscitation on the children. He said the father was unconscious.

"I have kids of my own," Rochefort said. "When you're in a situation like that you do what you have to do, but it wasn't easy."

Police said alcohol is not considered a factor in the accident.