(Updated at 4:55 p.m.) A construction worker has suffered serious injuries from a four-story fall off a roof in the Buckingham neighborhood.

The incident happened just before 4:00 p.m. on the 400 block of N. George Mason Drive. According to initial reports, the man fell from the roof of an under-construction, four-story condominium building onto a concrete surface below. The construction is for new townhouses in the Ballston Row development.

The victim was at least initially conscious and talking to those who came to his aid, but was bleeding from the head, according to scanner traffic. His injuries are described as life-threatening. He’s being transported via ambulance to the trauma center at George Washington University Hospital.

State occupational safety inspectors are being requested to investigate the incident.