You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
A police spokeswoman said police were contacted at 3.15pm about an incident near Benmore Pl.
One person had reportedly gone into the lake while fishing, she said.
"Every support possible has been summoned."
He was reported missing by a friend, who was fishing a short distance away.
The Coastguard was on their way and a rescue helicopter was on standby.