A worker was killed Friday at the Russia Wharf development site at 270 Congress St. after a heavy object fell on him in the construction site. Police and a medical rescue team arrived on the scene around 10am.

The worker was taken to Boston Medical Center where he was pronounced dead.

“It is with great sadness that we have confirmed that one fatality has occurred as a result of an accident,” the developer, Boston Properties, said in a statement. “Our thoughts and prayers are with the victim’s family at this time.”