A Lincolnshire Police spokesman said: “At around 5.20pm on June 9, a collision between a police car and a motorcycle occurred on the A1104 Miles Cross Hill, Alford.
“The rider of the bike was taken to hospital with serious injuries.
“Our officers were in pursuit of a red Audi at the time of the collision, after the driver had failed to stop for police.
“The Audi was later recovered and a 31 year old man arrested on suspicion of taking the vehicle without consent.
“The matter has been referred to Professional Standards Department who will investigate the circumstances.”
• Anyone who witnessed the collision, who has not yet spoken to police, is urged to get in touch by calling 101 quoting incident 347 of June 9 or email [email protected] quoting incident 347 of June 9 in the subject line of your email.
Alternatively, information can be reported anonymously by calling CrimeStoppers on 0800 555 111.