A man in his 30s has been stabbed in the Stamp End area of Lincoln.
The victim was hospitalised with serious stab wounds after the incident at an address on Napier Street last night.
The victim was also seen on Cannon Street at around 10.30pm.
Paramedics attended and rushed the patient to hospital while officers were quickly on scene.
Detective Inspector Dave Harrop said: “We are making extensive inquiries into this incident which we believe to be an isolated one.
“Anyone who witnessed anything that could have been connected to this incident needs to contact us.
“This could be suspicious behaviour in the area, a person fleeing the scene or if you saw the victim or offender yourself. Please pick up the phone and dial 101 as soon as you can.”
Anonymous reports can be put through to CrimeStoppers on 0800 555 111.
Alternatively, people can email [email protected] using incident number (536 of August 15) in the subject box.