A man was stabbed on Cherry Hinton Road in Cambridge on April 5 at around 2:30am.
The victim, in his 40s, was stabbed outside of the BP garage on the road.
Ambulance crews and Cambridgeshire Police officers attended the scene and the man remains in hospital in a critical condition.
An investigation is ongoing.
Anyone with information is urged to contact police via Cambridgeshire Constabulary's website using reference 35/23564/24. Anyone without internet access should call 101.
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