Speaking in the House of Commons, Home Secretary Theresa May said: "Could I also extend my sympathies to the family of the 13-year-old girl who died following a traffic accident involving a police patrol car on Sunday night.
"This matter is being investigated by the Independent Police Complaints Commission."
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Gulf War veteran Paul Briggs' widow, Lindsey, 40, launched legal action to have his life support withdrawn so he could "die with dignity".
Rescue workers are at the site Sunday morning trying to cut open mangled coaches.
Despite chilly temperatures it will be a mostly dry day, and milder than yesterday.