Crown Point police said officers responded to a parking lot in the 1200-block of East Summit Street around 7:35 p.m.
There, officers found a 45-year-old Cedar Lake man who had been cut or stabbed in the neck and back several times, police said.
The victim, who suffered non-life-threatening injuries, was transported to Franciscan Health Crown Point.
Police took two people into custody but later released them.
The investigation is ongoing, and police did not immediately provide further information.