The incident happened in the Elms Village area of Belfast on Tuesday evening.Mark McLoughlin told UTV he was travelling to a nightclub in the taxi with a group of friends when one of them, a man, kissed him in the back seat.He said the driver then pulled in on the Malone Road and ordered all the passengers to get out.Mark explained: "We were astonished and asked was he serious and he said 'yes, get out now'."So all four of us had to leave - not at our destination. It was absolute disgrace and illegal. I am not trying to demonise FonaCab as I know it isn't at all a homophobic company, but rather letting people know of our unfortunate experience with this particular driver."We rang them after we got out and they said there would be an investigation. They said they would ring me back and apologised. I was happy enough with it and knew it was sincere."A statement from FonaCab - which is a sponsor and supporter of the Belfast Pride festival - said the company is conducting an internal investigation into this incident.It went on: "FonaCab is aware of an alleged incident taking place and we are continuing to conduct an internal investigation into this matter."We have spoken to the customer and have apologised if any offence has been caused. However, as this investigation is ongoing, it would be unfair to comment in any more detail."We certainly would not condone this type of behaviour in any circumstance and would not tolerate this within our organisation."FonaCab is totally committed to encouraging equality and diversity and eliminating discrimination in our role as an employer and a supplier of taxi services to all those living in our community."Breaches of our internal policies are taken very seriously and as a sponsor and supporter of Belfast Pride, we have liaised fully with the organisation regarding this particular incident."