Six people, including a child, were found slain Thursday afternoon in a home on the Southwest Side, authorities said.

A police officer was called to a brick bungalow in the 5700 block of South California in the Gage Park neighborhood for a well-being check just after 1 p.m. When she entered the home, she found one person who had been stabbed to death, then discovered the other bodies, a police source said.

The victims were four men, one woman and one child, between 10 to 12 years old, a police source said. Interim Chicago Police Supt. John Escalante told reporters at the scene that there was no immediate threat to the surrounding community, although they’ve added additional patrols to the neighborhood.

“It’s very probably this is all the same family inside,” Escalante said. The bodies were found “in different locations” within the residence, he said.

Escalante would not provide details on how the victims were killed.

“We are taking our time going through the residence,” he said. “We’ll have the street closed off for quite a while this evening.”

Escalante did not indicate how long the victims might have been dead, but he said a co-worker requested the well-being check because someone who lived in the home had not been at work since Tuesday.

Investigators were waiting for officials from the medical examiner’s office to arrive to identify the bodies.

Markita Williams, a neighbor, said a family had lived in the home for at least the last three years. The family included a woman with two sons, who were grade-school age, and her parents. The woman was separated or divorced from her husband, who has since gone home to Mexico, Williams said.

Williams said she was unaware of any problems at the home and didn’t recall police being called there before.

Williams said she’s been racking her brains to remember when she last saw the family. She said her 21-year-old son last saw one of the young neighbor boys as Williams’ son returned home from work at 7 a.m. Tuesday.

At noon Wednesday, Williams said she knocked on her neighbors’ door because she noticed the grandfather’s van parked on the street and was worried it might be towed — because the city was due to do some street repairs, she said.

“I didn’t get an answer,” Williams said. She noticed something else unusual — the curtains were all closed.

“They keep their curtains open all the time,” Williams said.

She added that she had looked out her window about 5 p.m. Wednesday and noticed that the van still hadn’t been moved.

Another neighbor, David Lopez, has lived about two blocks north of the crime scene since 1997.

“It’s sad to see,” Lopez said. “It seems like instead of getting better, things around here are getting worse.”

Contributing: Ashlee Rezin, Jordan Owen