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Mystery surrounds killings of 6 Chicago family members in their home

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Five family members, including a 10-year-old girl and 13-year-old boy, bludgeoned or stabbed to death. One more shot dead.

And so, so many questions.

That's what Chicago authorities, not to mention friends and relatives of the victims, have said nearly a week after police found all six bodies inside a brick bungalow in the Illinois city.

"We are not ruling anything out or anything in at this point," Chief of Detectives Gene Roy said.

That means the grisly deaths could be the result of domestic violence, a robbery or perhaps something else entirely. However, they were not random with Roy saying authorities assume "the family was targeted."

Why, no one is saying.

Monica Arias told CNN affiliate WLS she never heard any signs of trouble coming from the single-family Gage Park home: "No screaming, no fighting, we heard nothing." Fellow neighbors described victims as family oriented, with Fani Maldonado calling one of them her "best co-worker" washing windows at O'Hare airport.

"He was a nice person," Maldonado said. "He never had a problem with nobody."

1 shot, rest killed by 'blunt' or 'sharp force injuries'

Markita Williams knocked on the family's front door last Wednesday after noticing a van outside, one she worried might belong to someone inside and be towed.

No one answered.

"Everything was closed up tight," said Williams, who has lived directly next door for three years. "They always had their curtains open -- you could see directly into the house from the front and on the side."

Police showed up the next day after someone called 911 worried that his or her co-worker, who lived there, hadn't shown up for work two days in a row, interim police Superintendent John Escalante said.

They arrived to find six people, all of whom were killed in what the Cook County Medical Examiner's Office ruled were homicides. But not all the same way.

Maria Herminia Martinez, 32, died of multiple gunshot wounds. The cause of death for two others, 58-year-old Rosura Martinez and 38-year-old Noe Martinez Jr., was listed as "multiple blunt and sharp force injuries due to (an) assault." And the remaining three victims -- Alexis Cruz, 10; Leonardo Cruz, 13; and Noe Martinez Sr., 62 -- all died from "multiple sharp force injuries," according to the medical examiner's office. In a police dispatch call, an officer indicated at least one of the victims had been stabbed.

Authorities haven't identified any suspects yet, saying only they don't think there's a threat to the surrounding area. Chicago police spokesman Anthony Guglielmi told CNN on Saturday that investigators "are reviewing the autopsy reports and moving from evidence recovery to a comprehensive criminal investigation."

And they're not the only ones trying to make sense of this travesty.

"It's just one of those things I can't explain. Good family, good kids," Williams said of her late neighbors. "I just don't know."

'A complex investigation'

The deaths echoed far and wide, with the Mexican consulate in Chicago retweeting several stories about its efforts to help move some, if not all, of the victims' bodies to Mexico.

The Chicago funeral for all six victims will be held Sunday night at St. Gall Catholic Church in Chicago.

Back in the working class southwest Chicago neighborhood, a steady stream of people offered flowers and prayers at a makeshift memorial outside the home. Dozens wiped away tears during an emotional vigil Sunday at the same spot, where six white crosses stood tall in memory of the victims.

In addition to sadness, there was also regret.

"Being so close, we feel like maybe we could have, I don't know, noticed something," neighbor Mayra Diego said.

Roy, the Chicago police detectives chief, has said there were no signs of forced entry into the home -- suggesting someone let the killer or killers in, rather than them forcing their way. The house wasn't ransacked. And the victims were not tied up.

If any one of those facts were different -- if the house was turned upside down suggesting theft was the motive, or if everyone was lined up and killed execution-style -- it might make things clearer.

Instead, as Roy pointed out, "This is a complex investigation."