A gun-wielding camper has opened fire in an American national park – because he says he saw Bigfoot.The man, who has not been named, offloaded several rounds at Mammoth Cave, in Kentucky, after telling other overnight visitors the half-man-half-ape had lunged at him.Park rangers have since said they had found no evidence Bigfoot was there – but are investigating the fact a firearm was fired.Madelyn Durand and Brad Ginn, who reported the incident, said the shooter had woken them at 11pm on Sunday by shining a flashlight in their tent."We got out and saw a man [and his son] who told us their campsite had been destroyed by someone or something," said Ms Durand, 22. "We heard them coming back about 10 minutes later. We heard them yelling 'I see it'.“We saw the flash from his gun, and he shot maybe 20 yards from the side of our tent into the pitch-black darkness."Asked if she was scared, the Western Kentucky University student told CNN: "I was mostly just co
