The delays caused by baggage handling firm Swissport at Gatwick Airport are "clearly a management failure", according to the Shadow Transport Secretary.
Mary Creagh told Good Morning Britain there had been "a failure to plan adequately for the summer peak" and called for "strong action" by airports, airlines and Swissport/
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Two were taken to hospital and three others were treated at the scene.
Nikki Haley said the organisation was not worthy of its name.
Rain in the northwest with some heavy outbreaks will sink slowly southeastwards