Speaking after this afternoon's crash, Nottinghamshire Police issued this statement.
"A police vehicle responding to an emergency call has been in a collision with another vehicle in Nottingham this afternoon.
"A man and a boy have been taken to hospital. The male police officer was uninjured.
"An investigation has begun and is on-going."
More top news
A spokesman for Derbyshire police said that the cyclist was killed in a collision with a lorry near a roundabout off Raynesway in Derby.
Two young people from Worcester have been disqualified from keeping animals for life for starving two pet dogs, one of which later died.
Police say they are investigating the incident to see if it was placed there with intent to cause danger to other road users.