Protesters with a megaphone reportedly shouted abuse at pregnant women attending a COVID-19 vaccination centre in Londonderry on Saturday.
Police are appealing for witnesses following the incident which happened at around 2:15pm.
They say three to four protestors came into the Foyle Arena via the exit doors, carrying leaflets and a megaphone.
They were said to have shouted abuse at a number of pregnant women attending the clinic, who were clearly upset by what happened.
Constable Laura Brown said the protestors had left the arena by the time police arrived at the location – and although officers carried out patrols in the area, they were unable to locate them.
“We are keen to identify the individuals involved in this protest and would ask anyone who was at the Foyle Arena and saw what happened – or has any information about the incident – to get in touch with police on the non-emergency number 101, quoting reference number 1021 of 14/8/21,” she said.