Northern Territory Police are searching for a man who was last seen jumping into the Katherine River.
The 27-year-old male entered the river near the community of Binjari, approximately 12 kilometres south west of Katherine, at around 10:30am this morning.
There were several sightings of the man when he was in the river, however police lost sight of him due to the amount of foliage in and around the riverbank. He has not been seen since just after midday, Northern Territory Police say.
A search and rescue operation is currently underway.
The matter is being investigated as a serious custody incident.
Anyone with information is urged to contact police on 131 444 or Crime Stoppers.