CHICAGO (CBS) — Six people were found dead inside a Gage Park home on the South Side on Thursday and Chicago police are conducting a murder investigation.

The victims were four adults and two children — ages 10 and 13 — all from the same family. Some were found tied up stabbed inside the brick bungalow in the 5700 block of South California Avenue at 1:05 p.m.

READ MORE: Chicago Weather: Friday Morning Temperatures In The Single Digits

Six people were found dead inside a home in the 5700 block of S. California. (CBS)

Six people were found dead inside a home in the 5700 block of S. California. (CBS)

A man called police, asking for a well-being check, and the residents of the home were found dead.

Markita Williams, a neighbor, told the Chicago Sun-Times 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 her 21-year-old son last saw one of the young neighbor boys at 7 a.m. Tuesday.

At noon Wednesday, Williams said she knocked on her neighbor’s 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.

READ MORE: Doggy Daycare Owner Appalled After Cook County State's Attorney Declines To Prosecute State Inspector Jose Guillen, Who Was Caught On Camera Groping Her

“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. Williams said she looked out her window about 5 p.m. Wednesday and noticed that the van still hadn’t been moved.

Chicago Police Supt. John Escalante said police were called after a co-worker of one of the victims had not reported to work for the past two days.

“There are signs of trauma to the bodies,” he said, adding police are still working to identify the victims.

“This is going to take some time,” he said.

“We don’t believe there is any threat to the surrounding community.”

MORE NEWS: Chicago Weather: Single Digits On The Way

The victims’ bodies were found in different parts of the home, Escalante said. He said that a family lives there, but police have not yet determined if all of the victims were related.