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'Laughing gas' spill at South Tyneside Hospital

Chemical spill at South Tyneside Hospital Credit: ITV Tyne Tees

Firefighters were called to South Tyneside Hopsital after a chemical spill caused a release of nitrous oxide.

Two chemicals mixed together to create the substance commonly know as laughing gas, on Tuesday.

Three people were treated after complaining of sore throats.