Police have described the death of a woman found dead in a lake on the grounds of a university in Norwich as "unexplained".
The body was discovered by a fisherman in a part of the university known as the University of East Anglia (UEA) Broad, which is on a campus site west of the city.
Detective Chief Inspector Dennis Lacey, who is leading the inquiry into the death, said they has no idea how long the woman’s body had been in the water.
Speaking at a press conference, where he was appealing for help to try to identify the woman, DCI Lacey refused to rule out suicide or whether something "untoward" had happened to her.
He described it only as an "unexplained death".
"We are unable to put an age to the female or how long the body has been in the water. We are hoping we can conduct a post-mortem this evening with a view to revealing those details," he said.
DCI Lacey added that the woman was fully clothed but would give no further details of her attire other than to say she was wearing "day clothes".
Police were called to the lake on Thursday at 8.40am by the fisherman.
The lake, known as the UEA Broad, is at the southern-edge of the campus and is a man-made lake which is not part of the river network.
There are signs making it clear that swimming is not permitted and students are warned about the dangers in information during their induction.
However, the area is accessible and used by the public.
Initial enquiries have been carried out with UEA and at this stage it is believed all students have been accounted for.
Police are unable to confirm the age of the woman at this time and enquiries to identify her are continuing.
While some summer camps are currently being held on the campus, most students have left for the summer holidays.
A UEA spokeswoman said: "We were informed that a body was reported in University Broad shortly before 9.00am.
"We have no further details at this time. The university will be fully supporting the police with their inquiries."
A cordon has been put in place around a small beach area.
There are several no swimming signs around the beauty spot, which is popular with joggers and dog walkers.
The lake area was quiet today but several people could be seen swimming and paddling in a nearby river.