Police are searching for a man seen rappelling off the Brooklyn side of the Brooklyn Bridge Thursday morning.

Authorities say a witness called 911 reporting a man using ropes to rappel down from the bridge onto a roof near Old Fulton Street and Front Street in DUMBO.

The man initially tried to climb down from the bridge on construction netting but the netting wasn't long enough, so he shimmied back up, grabbed a hose and rappelled down, according to the witness, a 28-year-old man who had just finished doing yoga with a friend on the roof of his Brooklyn apartment when he spotted the man.

"We were pretty worried for his safety, as you can imagine," said the witness, who did not want to be identified. "Especially when he was on the net, but actually he was incredibly strong because he managed to pull himself back up and down with the hose."

Police showed up a few minutes after the witness called 911 and found the hose but no sign of the man.

It is unclear what the man was doing on the bridge.

Traffic on the bridge was not affected by the investigation.