A type of concrete which is prone to collapse has now been discovered at two schools in Wales.
The schools in north Wales are the first in the country where reinforced autoclaved aerated concrete (RAAC) has been identified.
Two secondary schools, Ysgol David Hughes and Ysgol Uwchradd Caergybi will be temporarily closed, Anglesey County Council has confirmed.
Read more: Full list of schools affected in concrete crisis
The temporary closure will allow further safety inspections and mean alternative planning can take place, the council said.
Thousands of pupils in England are already facing disruption at the start of term this week following an order to fully or partially close 104 schools because of concerns about RAAC.
Labour in Westminster have attacked the Conservatives’ response to concerns about the concrete.
Schools in Wales are the responsibility of the Labour-run Welsh government.
Anglesey council leader Llinos Medi said concerns over RAAC was an “evolving and emerging national issue”.
“We appreciate this will be disappointing for all staff and pupils. However, their safety is our main priority,” she said.
Cllr Medi said the council would work to minimise any disruption to children’s education.
The Welsh government’s education minister, Jeremy Miles, said his “main concern” was staff and pupil safety.
“We’re making these decisions together to keep staff and pupils safe,” he said.
“Anglesey council and the schools are doing everything they can to minimise the impact on pupils.”