Separate investigation comes after it was revealed that Cistercian monk allegedly abused at least 11 girls in 1970s and 80s

Detectives are investigating a second man over accusations of sexual abuse on Caldey Island after it was revealed that a Cistercian monk allegedly abused at least 11 girls in the 1970s and 80s.

Police said the alleged assault took place at about the same time, and the accused was visiting the island off Tenby in Pembrokeshire, south-west Wales.

Officers refused to give further details because they said it would jeopardise the investigation, but said he was not a member of the abbey or abbey staff.

The Guardian reported on Friday that six women claimed they were abused as children by Father Thaddeus Kotik.

Since then, it has emerged that five others allegedly suffered abuse, and earlier this week, the head of Caldey Abbey issued an apology acknowledging that allegations of serious child sexual abuse made against Kotik should have been passed on to police.

Dyfed-Powys police are aware of allegations by eight women – the six original complainants and two more who have since come forward. A spokesperson said: “Following the recent media reporting of sexual abuse at Caldey Island, police received two further reports of non-recent sexual abuse.

“They relate to offences committed during the same time period (between 1977 and 1987) and with the same named perpetrator, Thaddeus Kotik. These crimes have been recorded and officers are in contact with the victims during the investigation and to offer specialist support.

“Police have also received one further report of a sexual assault by another male at Caldey Island around the same timeframe. The report has been made by one of the original six victims.

“This is being investigated separately to the Caldey Island abuse and concerns a man who was visiting Caldey Island at the time and no longer lives there. No further information can be released at present as it would jeopardise the investigation.”

Simon Thomas, a Plaid Cymru AM, said: “What is most troubling about this case is that the victims of sexual assault felt that they were not able to make a complaint at the time, and that complaints made were not dealt with properly. As a result the perpetrator was never brought to justice and children grew up bearing the weight of being a victim of these terrible crimes.

“Caldey Island is a landmark on the Welsh coast, and children and tourists visit there every day to learn about the abbey’s history. It’s important that people can visit there with confidence. ”

A Welsh Government spokesperson said: “We would encourage anyone who has suffered abuse to come forward and report it to the police by calling 101.”