Published Thursday, 15 May 2014
On Tuesday the PSNI posted a message asking for those working at St Joseph's Primary School between 1990 and 1996 to contact them.
It has since been removed from the social networking site by the police.
It is not known what the police are investigating, however, they have stressed it is not of a sexual nature and does not involve current staff or pupils.
UTV understands the enquiry concerns a female former teacher at the school.
The school has told UTV it was "taken by surprise" by the posting as it was the first they had heard about the investigation.
On Thursday morning a senior officer visited the school to apologise for the actions of detectives in the way they handled the matter.
A police spokeswoman said: "The PSNI accept that while some enquiries had been initiated with the school, upon reflection our intent to issue an appeal via Facebook should have been made clear to the school authorities prior to the post appearing and failure to do so was an oversight on our part for which we have now apologised to the school.
"We would once again emphasise the police investigation does not relate to any offences of a sexual nature and we extend our apologies to the school, its staff and pupils for any concern or confusion caused.
"We have advised the school of their right to contact the Office of the Police Ombudsman if they wish to do so and as such it would be inappropriate to comment any further on this ongoing enquiry at this time."
The school, in conjunction with the Council for Catholic Maintained Schools, has issued guidance and assurances to staff and parents regarding the matter.
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