More than 20 people were injured or killed in a series of violent incidents across Chicago last weekend.

An altercation outside of a nightclub on West Division Street in the Gold Coast left four men injured, including a Chicago police officer, the Chicago Sun-Times reports. Around 4 a.m. Sunday, a 24-year-old man allegedly pulled a knife, stabbing two men and battering a third before a police officer intervened, sustaining “non-life threatening injuries." Charges have not yet been filed.

Elsewhere in the city, at least three fatalities have been attributed to gun violence over the weekend, including 29-year-old man Dantrell Winford, who was found in Gresham Saturday night, 25-year-old Delwin Hawkins, who died at Advocate Christ Medical Center Saturday afternoon, and 18-year-old Thaddeus Tucker, who was found on a Far South Side sidewalk with multiple gunshot wounds to the head at 1:50 a.m. Saturday, Fox Chicago reports.

Fourteen people were wounded by gunfire across the city over the weekend, including three women.

In South Austin Sunday night, Chicago police officers shot a man who refused to drop a tire iron during a standoff, NBC Chicago reports. Police say the man pulled a tire iron from his waistband when police approached, and was arrested and taken to an area hospital with non-life threatening injuries. Two other men who fled the scene when police approached were not apprehended.

Outside of Chicago, 14-year-old Dajae Coleman was fatally shot in Evanston around 10:30 p.m. Saturday. Police believe he was not the intended target.