The Washington Post newspaper claimed his real name was Mohammed Emwazi, a computer programmer from west London.
The University of Westminster says it is "shocked and sickened" by claims a former student is the Islamic State militant known as "Jihadi John".
The extremist featured in videos showing the execution of Western journalists and aid workers has been identified in media reports as Mohammed Emwazi.
Reports suggest Emwazi was radicalised after leaving the University of Westminster.
A spokesperson said: “A Mohammed Emwazi left the University six years ago. If these allegations are true, we are shocked and sickened by the news. Our thoughts are with the victims and their families.
“We have students from 150 countries and their safety is of paramount concern. With other universities in London, we are working to implement the Government’s Prevent strategy to tackle extremism."
Downing Street have declined to confirm or deny that the reported name of the IS militant fighter known as 'Jihadi John' was known to the intelligence and security services and said any information in the public domain that would potentially damage the "ongoing investigation" was a matter of concern.
ITV News understands the man named by media outlets as Jihadi John comes from the West Kensington area of London, and that he left for Dar Es Salaam in Tanzania in May 2009 in the company of two other men.
It is also understood that the security services in the UK had had previous contact with him when they suspected he was going to fight in Somalia.
The Metropolitan Police says it will not confirm the identity of "Jihadi John", and claimed it had asked media organisations not to speculate on the details "on the basis that life is at risk".
Commander Richard Walton, head of the Met's Counter Terrorism Command, said: "We are not going to confirm the identity of anyone at this stage or give an update on the progress of this live counter-terrorism investigation."
Downing Street has refused to confirm or deny reports of the identification of an Islamic State militant known as "Jihadi John".
The man - identified in a number of outlets today - has been pictured in a series of videos showing beheadings of captives, including British citizen Alan Henning.
ITV News cannot independently verify details about him at this stage.
A 23-year-old radiographer in the late 1970s at the hospital, known as victim 19, said she often saw Savile walking around the hospital at night, helping the porters.
The woman also noted that:
Oscar-winning actor Eddie Redmayne will be following up his huge success by lending his voice talents - to Thomas The Tank Engine.
The London actor is just one of a host of stars who will voice trains in the little blue engine's latest adventure, to mark 70 years of the beloved character. New friends introduced to mark the special anniversary year will include Ryan, voiced by Eddie, and Sailor John, played by acting legend John Hurt.
Jimmy Savile's brother was likely also a serial sex abuser at a London hospital, a report today has claimed.
Johnny Savile, the entertainer's older brother who died in 1998, was accused of molesting and possibly raping women at Springfield Hospital in south London, the report said.
The claims were made between five women between 1978 and 1980, and related to his time as a recreation officer at the hospital in the 1970s - with the last two culminating with him being sacked for gross misconduct of a sexual nature in 1980
The allegations were uncovered by officers involved in Operation Yewtree.