A prominent north Dublin sports coach is under investigation for sexual assaults on two teenage girls.
The suspect, who is aged in his 40s, has not been formally been arrested but officers have seized his phone and other material, including a computer, as part of the investigation.
The issue came to light when the parents of two under-age girls found what have been described as "highly explicit text messages" from the trainer.
It later emerged that the well-known sports figure had carried out sexual acts on the girls at the apartment that he lived in at the time.
Gardai now fear that the individual may also have other victims due to the fact that he had "significant contact" with children as part of his job.
Sources say that the detailed probe into the allegations is at an "advanced stage".
It is understood that since the allegations surfaced a number of weeks ago, he has moved out of the property and is staying at other locations in north Dublin.
Sources said they are investigating if the individual groomed the teenage girls.
"The nature of the incidents that he has been accused of were consensual between him and the girls but because they are under-age, serious crimes have been committed," a senior source told the Herald.
"Gardai are working on the theory that he groomed these girls."
The alleged incidents, which are said to have occurred at the man's apartment, happened within the past year.
Officers are now trying to establish whether the coach has other victims.
The allegations have shocked many people in the north Dublin suburb where he works, including respectable business people who had sponsored the sports coach.
Meanwhile, in a completely separate investigation, gardai have made no arrests in the case of a woman who was attacked and sexually assaulted at Tir Na nOg park in Carpenterstown a fortnight ago as she walked to work.
Last weekend, gardai issued a photofit of the suspect.
He is white, around 5ft 8ins, in his late 20s with straight brown hair and spoke with a foreign accent. He wore braces on his teeth and was wearing a grey hoodie top and dirty beige trousers at the time of the incident.
Gardai are appealing for witnesses or anyone with information to contact them, particularly those who were in the vicinity of the park between 6.45am and 7.45am on October 18.
The man attempted to strangle the woman with a belt, then punched her in the head before dragging her to the ground and assaulting her before she managed to flee the scene.
Gardai carried out a reconstruction of the incident which will be aired on RTE's Crimecall programme.