The school is remaining closed

Emergency crews took 25 pupils and a teacher from Crookhill Primary School in Ryton, near Gateshead, to hospital after they complained of feeling sick.

The Health and Safety Executive (HSE) said they suspected three gas boilers under a classroom were responsible.

The school remained closed on Wednesday as the HSE and specialist engineers examined the boilers.

The children were treated at South Tyneside District Hospital, Newcastle General and the Queen Elizabeth in Gateshead on Tuesday.

Eight were found to have raised levels of carbon monoxide and were treated with oxygen.

HSE control

Bob Jarman, A & E consultant at Gateshead Health NHS Foundation Trust, said the levels of carbon monoxide measured were "not thought to be worrying."

Only one girl was detained overnight for observation.

Pam Waldron, head of HSE operations in the North East said: "The focus of our enquiries is the three gas fired boilers underneath the classroom and their fluing arrangements.

"Yesterday we issued a notice that the boilers should not be used and access to the boiler room is currently under HSE control."

Representatives from the school and Gateshead Council will meet on Wednesday to discuss the progress of the investigation.