The stabbing happened on Friday night in the Fish Street area of the city centre, police say.
Emergency services were called to reports of a stabbing in the Fish Street area of Leeds city centreEmergency services were called to the Fish Street area at about 18:50 GMT on Friday.
Det Insp John Graham, of Leeds District CID, said: "We are in the early stages of our investigation and are working to establish what has taken place and identify those involved."Det Insp Graham added: "I would like to reassure the community that we take incidents of this nature very seriously and we will do everything we can to find those responsible."
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