A Mater Hospital staff member was shockingly assaulted while working in the emergency department over the bank holiday weekend.
The incident happened at 3:10am last Friday.
A garda spokesman told Dublin Live that officers are "making enquiries" into the incident.
Read more: INMO calls for urgent action following explosion of Covid-19 cases in Mater Hospital
They said that no arrests been made and no injuries have been reported.
The Mater Hospital declined to comment on the assault, saying the hospital "does not comment on individual cases in order to protect patient confidentiality".
Last week the Mater urged the public to avoid its emergency department, saying that services are "under extreme pressure" due to a "combination of large numbers of people contracting Covid, high numbers of presentations at the ED and high levels of staff absences due to Covid-19".
The INMO’s Director of Industrial Relations Albert Murphy said the Mater's emergency department was seven nurses short due to Covid-19 absences.
He said: "The Mater Hospital issued its own statement earlier today calling on the public not to attend due to extreme pressure on the hospital."
He added: "There are significant numbers of staff absent due to COVID and it is understood that there were 8 ambulances on hold outside the hospital’s emergency department this afternoon.
"Due to COVID absences the ED does not have the required agreed staffing levels and there are currently seven nurses short from the agreed roster.
"The hospital needs to ensure that staff and patients are protected during this crisis and that it takes all necessary safety measures. We are seeking an urgent meeting with the CEO of the Hospital to discuss this matter."
Read more: Deltacron Covid variant: What are the symptoms of the new strain?
Read more: Dublin children 'less sociable' since beginning of Covid-19 pandemic, national survey claims
Sign up to the Dublin Live Newsletter to get all the latest Dublin news straight to your inbox.
