Gallagher said the friends of the missing swimmer and any witnesses were still at the bottom of the falls and were in the process of being brought back up to the top.
Nearby residents had gathered at the scene after hearing a helicopter fly above their properties and over the falls.
One resident, who did not want to be named, said everyone knew when the helicopter flew past it was bad news.
"It is a nice place but it is dangerous," he said.
He believed it was the third time this year a helicopter had been called to an incident at the falls.