Debris is pictured strewn across the A40 which has been closed in both directions after the multi-vehicle crash.
The collisions stretched for more than half a mile near Witney in Oxfordshire.
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His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.
The Foreign Secretary said he thinks the health service should be "at the very top of the list" for a windfall after the UK leaves the EU.
Turning wet and breezy from the west overnight.