Update: The University of Westminster has since informed HuffPost UK the signs have been on campus for "a while".
The University of Westminster is on amber security alert status, issuing warnings to students and staff it may be carrying out random bag and vehicle searches, following the revelation Jihadi John is an alumnus.
This week it was revealed the brutal ISIS murderer was in fact Mohammed Emwazi, who graduated from Westminster in 2009.
The sign reads:
"A heightened state of awareness of potential security problems or threats.
The University reserves the right to undertake random bag & vehicle searches, spot checks on ID cards and additional building patrols. All students, staff and visitors are to present ID cards on entry to buildings. All visitors must be accompanied by a member of staff whilse on University premises and have a prior appointment. All students and staff are asked to be extra vigilant for suspicious packages and persons, and report anything of this nature to Reception."
The university announced on Thursday it had postponed an event hosting a controversial Islamic speaker due to security concerns.
Sheikh Haitham Al-Haddad was due to speak to the Islamic Society at an event titled "Who is Muhammad?"
The university's LGBTI society had called Al-Haddad an "anti-gay preacher" and "homophobic".
The University of Westminster Islamic Society (ISOC) released a statement on its Facebook page apologising for the inconvenience after the event's postponement. ISOC had originally organised Al-Haddad to speak on misconceptions surrounding the Prophet Muhammad, with the University of Westminster Students Union backing the event.