A CONSTRUCTION worker and fireman were seriously injured in a construction accident yesterday.

Police received a call at 12:44 p.m. that a 52-year-old worker had fallen 30 feet from the steel frame of a building being built at 19th and Arch streets.

The worker was rushed to Hahnemann University Hospital, where he was in critical condition, police said.

Jay Schneider, 36, a maintenance worker working on the roof of Russell Byers Charter School across the street from the accident, heard sirens and filmed the incident on his cellphone.

The video shows the worker being taken out of the site in a bucket attached to a crane and then loaded into an ambulance. At the same time, fire crews on the scene rushed to help a fireman who had collapsed.

Police said the fireman suffered a seizure and head injuries resulting from the seizure. He was listed in stable condition at Hahnemann, police said.

The accident happened three blocks away from the site of the June 5 deadly building collapse at 22nd and Market streets.