Police are appealing for information to help identify a woman who was rescued from the lake at the University of East Anglia.
The emergency services were called at about 2.40pm yesterday following concerns for the safety of a woman seen to have entered the lake.
After being rescued she was airlifted to Norfolk and Norwich University Hospital where last night Norfolk Police said she was in a critical condition and her identity remained a mystery.
A police spokesman said: 'No personal belongings, other than a key attached to a red Cath Kidston key ring, have been found and despite carrying out a number of enquiries, efforts to identify the woman have been unsuccessful.'
She is described as aged in her 40s or 50s, of medium build, with short dark greying hair.
She was wearing dark blue jeans, with a brown leather belt, a grey long-sleeved top with a sequin pattern on the front, a white or cream faux fur front button coat and brown laced ankle boots.
Anyone with information should call Norwich CID on 101.
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