The small plane that crashed at Aspen airport is believed to be a Bombardier Challenger 600 and was flying to the Colorado city from Tucson, Arizona, an ABC News affiliate has reported, citing air officials.
ASPEN UPDATE: FAA spokesperson says airplane that crashed appears to be a Bombardier Challenger 600, coming from Tucson to Aspen
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The chancellor now faces the prospect of forming a minority government or calling for a snap election.
The 73-year-old said a return is unlikely "given the politicised atmosphere that seems to have afflicted our set."
Chancellor Philip Hammond said the UK will make a financial proposal to the EU in the next three-and-a-half weeks.