Officers say they were threatened by a man with a firearm.
The injured man is under arrest and in a stable condition in hospital.
We have referred the matter to the IPCC and will support them in their investigations."
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The Exeter-based firm said its drive to improve the reliability of its planes will see profits dive in the first half of the year.
Following criticism from MPs and campaigners, the work and pensions secretary said the helpline would be free by the end of the year.
Wednesday will be wet to start with and will remain overcast for much of the morning, perhaps with mist and hill fog for some.