Crews think a compromised metal bottom cover on the porch led to this collapse.

MADISON, Wis. — Cameron Knott said he couldn’t believe his ears or his eyes when a balcony collapsed at a home on Mifflin Street during the annual unsanctioned Mifflin Street Block Party, injuring three people.

“You heard the cracking of the wood and then a lot of people screamed because it really doesn’t happen ever,” Knott recalled.

He described the aftermath as being like a scene out of a movie.

“There were actual people on the ground unconscious which is a pretty scary sight. I’ve never seen anything like that,” he said. “It was especially scary because I know someone that lives in the house and you are just thinking, ‘I hope they are okay,'” he said.

RELATED: Three injured, two hospitalized in porch collapse at Mifflin Street home

Three people injured suffered non-life-threatening injuries in the process; two were taken to a hospital. An update on their conditions was not available Monday.

Josemaria Donoso, the housing inspection supervisor who had just inspected and cleared the house in March, said that is fortunate.

“We will learn from this. I think we were lucky this time,” said Donoso.

Crews think a compromised metal bottom cover on the porch led to this collapse. Donoso said there was nothing they could see during their inspection that would have raised a red flag. His focus is to make sure this never happens again.

“It’s a concern for the Madison Police Department, it’s a concern for the fire department and it’s a concern for the city,” he said.

The city believes the house itself is stable and the people who live there can stay.

Speaking to News 3 Now off-camera on Monday, longtime downtown Ald. Mike Verveer said the has always been a fear of his with Mifflin Street. 

He added the city is looking into all options to improve — including trying to work through a state law that doesn’t allow inspectors to go inside a home unless a complaint is filed.