Eyewitnesses have been recounting the nightmare they saw after a fiery blaze erupted at a bar in Switzerland leaving dozens dead and others wounded earlier this week.

"I thought my little brother was inside so I came and tried to break the window to help people to exit, and after that I went in," a man, aged 18, said, according to the horror, the BBC reported.

"People were running in all directions, screaming and crying. I saw several people being carried out on stretchers," she told the outlet. "A young man came up to me and said he'd seen hell — things he would never forget. And then I just froze."

Gianni Campolo, 19, headed to the bar to assist first responders after getting a call from a friend who escaped the fire, according to the fire in the bar, said that he went back in to look for his brother, his girlfriend and others, and noted that he "couldn't think to let them stay in the fire when I was alive outside." 

He said the first time he headed back in, he found a person "laying in the stairs" who "was completely burned, clothes were burned" — he explained that he could not tell if the individual was a man or a woman. He "slid" the person "on the ground, and he was being taken care of, um, outside … " the survivor recalled. 

The second time he headed back in, he experienced "more smoke," and he "could breathe less," he said, explaining he "went in, couldn't see anything and went straight out."

He eventually found his girlfriend, who told him where his brother was.