Foyle Search & Rescue in Derry is trying to locate a 23-year-old man who entered the River Foyle.
The charity said that on Saturday morning Donal Armstrong entered the river and unfortunately he has not been recovered.
At present FSR is searching using, boat, drone, sonar and shore.
In coordination with his family, FSR was asked to share information with the public.
Donal Armstrong is 23, of thin build, with short fair hair with a reddish tinge. He was last seen wearing a navy jacket with a white crest on the breast (ripped on the back right armpit), navy hoodie under the coat and an orange T-shirt below this, black trousers, blue trainers with brown soles and light blue lines on the heels.
There will be no public call out from FSR to assist in the search, however if members of the public wish to walk the shoreline they’ve been encouraged to do so safely.
Scores of people expressed their sadness at the news and offered to help the family.
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One friend said: “Our funny, amazing staff member Donal!
“Please help bring him home to his family. If anyone along the water can see anything, please reach out to Foyle Search and Rescue or the Police Derry City & Strabane
“We will be helping search and will be doing planned walks, please get in touch if you wish to join us an help.”
Advising anyone who may wish to help, FSR said personal safety is of the highest importance and provided the following safety guidelines:
In the event of finding any items of clothing etc, FSR advised the public not to touch or remove them. Instead, contact the PSNI on 101 who will in turn alert Foyle Search & Rescue.
“If an item of interest is in the water, stay close enough to keep an eye on it but do not go any closer. If the object is moving, try and walk along with it. Contact 101 who will in turn alert Foyle Search. Tell the operator the direction the object is floating in. If possible follow the object until help arrives.
“If you notice a body, do not go any closer or attempt to move. Dial 999 who will alert Foyle Search & Rescue. Give as much information as you can.”
If you have any queries please feel free to get in touch with FSR on 02871313800.