A violent blast at the RM Palmer Company plant rocked the town of West Reading shortly before 5 p.m., local officials said.

A spokesperson for Reading hospital told NBC that of the eight patients, one was transferred, two were in fair condition and the rest had been released.

Video posted on social media showed the building violently explode, sending debris and flames flying into the sky.

The cause of the blast remains under investigation, but officials said they believe it may have been the result of a gas leak.Renèe Rivera/FacebookThe violent blast at the RM Palmer Company plant rocked the town of West Reading shortly before 5 p.m.APClips of the aftermath showed parts of the building laying out in the street as smoke continued to smolder from the remnants of the building.

“It’s pretty leveled, unfortunately, there’s not too much to be able to salvage from it,” Mayor and local firefighter Samantha Kaag told WPVI.

The confectioner, one of the country’s largest, employs 850 people and specializes in holiday novelties like chocolate Easter bunnies, according to the company website.