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Part of one of the largest schools in Caithness has been closed off following potential concerns about the structure.

The move follows an inspection by engineers of the three-storey 1960s-era extension block at Thurso High School.

Highland Council said potential issues had been identified in relation to the condition of the building's concrete frame.

The local authority said the rest of the school's campus remains operational.

The secondary school has a roll of about 750 pupils.

Caithness and north west councillor Matthew Reiss said Thurso High School was more than 60 years old and "probably past its sell-by date".

He added: "It is on high ground facing out to the north so the school building does take a fair hammering from wind and rain.

"For a number of years now there have been buckets out in various parts of the school catching leaks.

"However, internally, it has been incredibly well looked after by generations of staff, including janitors."