A major police response was sent to the 500 block of Fairlawn Drive in Round Lake Park after four people were shot | Photo: Craig/Captured News.

A 20-year-old man was killed and three others were wounded after a gunman began shooting outside a Round Lake Park home and then entered the home to continue shooting more people, police said.

The Round Lake Park Police Department responded around 1:15 a.m. Sunday to the 500 block of Fairlawn Drive for a report of shots fired.

Round Lake Park Police Chief George Filenko said that officers on patrol in the area heard the shots and found four adult males with gunshot wounds at a residence.

Filenko said that a family was hosting a party at the home when partygoers arrived that the family did not know so they began turning people away.

An adult male then arrived at the party and began shooting outside from the street before entering the home to shoot more people who were in the kitchen area, Filenko said.

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A 20-year-old Zion man was pronounced dead at the scene, according to Lake County Coroner Dr. Howard Cooper. Two other men were critically injured and transported to an area hospital. The fourth man shot sustained non-life-threatening injuries and was also transported to an area hospital.

A resident in the area told Lake and McHenry County Scanner he heard at least two dozen shots being fired during the shooting.

The Lake County Coroner’s Office responded to the scene and an autopsy has been scheduled for Monday on the 20-year-old Zion man, Cooper said.

The Lake County Major Crime Task Force was requested to assist the Round Lake Park Police Department with the investigation. Police said that the shooting was possibly targeted and not random.