By Steven Graves

AURORA, Ill. (CBS) — One person was killed and four others were wounded in a mass shooting early Sunday in west suburban Aurora.

As the investigation continued Sunday evening, police said they do not believe it was a random act of violence.

Police said the shooting happened around 2:30 a.m. at a home in the 700 block of Fifth Street.

As CBS 2’s Steven Graves reported, it was a scary sight – but for some, not necessarily a surprising one.

Hours later, hands with cellphones peered from an upstairs window of the home police surrounded after the shooting. But when we knocked, no one answered.

That was a contrast to the chaos neighbors described hours before.

“There was a lot of pounding and yelling at first,” said Stephany Ramirez.

Ramirez’s family was visiting from Colorado for the holidays. They were all shocked.

Norma Barrios listened from her window, horrified.

“When I heard the people, they were arguing and saying a lot of bad words,” she said. “But I was scared and closed the window.”

Barrios said about 10 gunshots followed. Police rushed to the scene and found three people who had been shot, according to Aurora Police Cmdr. Jack Fichtel. All three were taken to hospitals.

One was pronounced dead, and two others were stabilized.

A short time later, two other gunshot victims arrived at Rush Copley Medical Center on their own. They also were stabilized.

Police declined to identify any of the victims, or provide their ages or genders, other than to say they were all adults, both male and female.

As of Sunday evening, there was no one in custody.

“Obviously there’s an individual out there that is dangerous. However, we feel at this point, there’s no threat to the community,” Fichtel said.

The details of what happened remained a mystery.

“Usually there’s always arguing going on with, you know, the neighbors and stuff,” Ramirez said.

Late Sunday, latex gloves with alcohol bottles and glass shards were scattered through the front yard of the house.

Police were also piecing together stories from witnesses.

Officers do have some evidence they are processing, but they did not go into detail about what exactly was found.

Investigators were talking to witnesses who might help identify the shooter or shooters. Fichtel said anyone with information on the shooting should call Aurora police at 630-256-5500. Anonymous tips can be provided to Aurora Area CrimeStoppers at 630-892-1000.