Emergency officials said an unresponsive man was pulled out of the Allegheny River near the David L. Lawrence Convention Center in Pittsburgh late Wednesday morning.
Authorities said the man was seen talking on a cellphone near the river shortly before he fell in just after 11 a.m.
Officials said it wasn't clear if the man slipped and fell into the river or was stricken with some kind of medical problem.
Some witnesses who saw the man pulled him from the river and reported he was not breathing, but authorities said paramedics performed cardiopulmonary resuscitation and were able to get the man's heart beating before he was taken way in an ambulance.
“He was very lucky he was able to be seen and heard and he was close enough to the wall where bystanders were able to reach him. Any further out, it could have become a real rescue with divers,” river rescuer Mark Tomassi said.
The man's name and condition have not been released. He remains in UPMC Mercy Hospital.