A whole school has closed and moved lessons online over coronavirus concerns.
Pupils at Greenhill School in Tenby will move to online learning from Monday following a number of children having to self-isolate and increasing case rates of coronavirus.
It comes as First Minister Mark Drakeford said that a third wave was now "inevitable" and more than 1,000 other pupils across Wales are currently self-isolating.
Flintshire County Council alone said 820 pupils in 12 of its schools have been sent home to learn remotely again and self-isolate. Hundreds more are now self-isolating in other areas including Cardiff, Swansea, Conwy and the Vale of Glamorgan.
In a letter to parents, dated June 18, Greenhill School's headteacher Raymond McGovern said he "regrets" the decision but is the "best chance of breaking the chain of transmission".
The letter said: "As you will be aware we have been managing a number of positive Covid tests.
"This has required us to manage a very significant Track, Trace and Protect operation alongside NHS Wales and we are most grateful to them and the local authority for their support.
"I would also like to reassure everyone that whilst a number of the individuals who have tested positive are unwell, none are seriously so and most report what might be best described as the usual season flu symptoms."
See the number of cases where you live here:
The letter adds "clearly, our locality and the school are part of this picture of increased rates".
Analysis of the data, according to the letter, shows transmission of the virus is mainly via community contact.
During the last week, every classroom and communal area has been "fogged".
At the time the letter was sent all year 10 pupils were learning online from home due to a number of students identified as a close contact of an individual who tested positive.
Other year groups have a "number" of learners self-isolating which Mr McGovern said is "also having an impact on staff".
From Monday June 21 all learning will move online and the school will be closed to pupils. Staff will continue to work from the school.
Mr McGovern ends the letter: "I regret to make this decision, especially after such a successful start to the summer term but in consultation with Public Health Wales and the local authority I believe this is the most prudent option for everyone and gives us the best chance of breaking the chain of transmission.
"However, I do need to stress, this will only be the case if everyone observes the rules around social contact.
"Whilst these have been relaxed recently, what is in place must be strictly observed or we will find our school closed for longer and greater restrictions once again being imposed."
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