WICHITA, Kan. (AP) — Police are investigating after they say a man was stabbed while trying to intervene in an altercation in Wichita.

Wichita police Lt. James Espinoza said that three people were with a teenager Sunday night, when one of them began arguing and accusing the teen of owing them money. Espinoza said a 42-year-old man tried to intervene and a fight ensued, during which he was stabbed in the back.

The Wichita Eagle reports the man was taken to a hospital and was in serious condition as of Monday afternoon.

According to Espinoza, police are looking for the three people as well as the teenager.