Professor David Miller is being investigated by police over allegations of “a hate crime or hate incident taking place during lectures at the University of Bristol.”

Avon and Somerset Police confirmed to Bristol student newspaper The Tab that they were at the “early stage” of an investigation to establish if any offences have been committed by the sociology lecturer.

It also emerged that Professor Miller had gone on “sick leave”, meaning many students are still awaiting results of their January assessments.

Mr Miller’s personal tutees have been reassigned to other members of staff.

In a statement to The Bristol Tab, the Avon and Somerset Police said: “We have recently been made aware of a number of incidents that may constitute a hate crime or hate incident taking place during lectures at the University of Bristol.

“We take issues such as these very seriously. An email was circulated to student groups last week asking people to speak to the police regarding their experiences.

“Our investigation is at an early stage and enquiries are ongoing to establish if any offences have been committed.

“Our aim is to help everyone to feel safe and supported while studying in Bristol and we are working closely with the university at this time.

“Anyone with information that can assist us should contact 101 and give reference 5221036233.”

Bristol JSoc said: “Unfortunately we cannot comment as we are concerned it may affect any current or potential police investigation.”

Professor Miller and Bristol University have come under criticism in the past month following controversial comments made by the lecturer including the claim that attacks on him are “directed by the State of Israel”.

A campaign set up to support the lecturer has alleged that: “Far-right Zionist hate groups around the country are known to use spurious police complaints to intimidate pro-Palestine activists.”

A spokesperson for Bristol University said: “The University is seeking clarification from Avon and Somerset Police. If notified of a formal investigation, we will of course cooperate.

“Our freedom of speech policy underlines the vital importance of the right of staff and students, as members of a free and democratic society, to speak openly without fear of censorship or limitation, provided that this right is exercised responsibly, within the law, and with respect for others who may have differing views.

“Our clear and consistently held position is that bullying, harassment, and discrimination are never acceptable.  We remain committed to providing a positive experience for all our students and staff, and to fostering an inclusive University community.

“We can confirm that the University has already initiated an investigation into this matter.  The investigation is being carried out in accordance with the University’s internal process and, as we have explained in a previous statement, that process is confidential.  In particular, it is not appropriate for the University to make any comment on this matter while the investigation we have referred to is underway.”