CHICAGO (CBS) — Three people were shot and killed Sunday evening inside a home in the East Side neighborhood, and police were trying to determine if it was murder or self-defense.

Police confirmed someone shot a 24-year-old woman, a 22-year-old man, and a 17-year-old boy in a house near 102nd and Ewing around 5:30 p.m. Sunday.

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The homeowner initially told officers he shot three people who had broken into his home, but police said there are “inconsistencies” in the man’s statements. A police source said a witness told investigators the three people who were killed had been at the house all day.

Investigators have confirmed the homeowner has a valid Firearm Owners Identification card. They also said he was being held for questioning Monday morning, but police have not said if he will face murder charges.

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People who live and do business in the area said they wish they had more information about the incident; was it random or isolated?

“If we find out that it’s actually more of a contained situation – of you know, known persons to the known victim – then let’s get that out of the way, and this way everybody will feel a little safer. Mine is, like I said, I I don’t want my tenants running from the neighborhood,” said John Sandoval, a landlord in the neighborhood.

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Area South Detectives were investigating.