Hampshire and Isle of Wight Fire Rescue Service was alerted to the Solent Hotel and Spa in Whiteley to deal with a "large-scale incident" at 8.44 p.m. on Monday, Xinhua news agency quoted the Evening Standard newspaper report as saying on Tuesday.

An accidental mix of chemicals created a poisonous gas chlorine, local fire rescue team said.

Children were among those taken to hospital, said the newspaper.