Authorities searching for suspect in shooting deaths of 8 people over 2 days in suburban Chicago

A man shot and killed eight people at three locations in the Chicago suburbs and remains loose, authorities said Monday, while neighbours were left on edge as the hunt for the suspect continued.

A man shot and killed eight people at three locations in the Chicago suburbs and remains loose, authorities said Monday, while neighbours were left on edge as the hunt for the suspect continued.

Police in Will County and the city of Joliet said they did not know of a motive for the killings, but said the suspect, 23-year-old Romeo Nance, knew the victims. The FBI's fugitive task force was assisting local police in the search for the suspect, Joliet Police Chief William Evans said.

The victims were found Sunday and Monday at three separate locations, authorities told reporters Monday evening, several hours after warning on social media that the man should be considered "armed and dangerous."

One of the people killed was found Sunday in a home in Will County. Seven others were found Monday at two homes in Joliet, located about about six miles (9.6 kilometres) northwest of the scene police discovered first.

Authorities said they also believe another shooting in Joliet that wounded a man on Sunday is connected to the string of violence but would not discuss their evidence.

"I've been a policeman 29 years and this is probably the worst crime scene I've ever been associated with," Evans said during a news conference outside the Joliet homes Monday evening.

Will County Chief Deputy Dan Jungles said during the news conference that deputies had been staking out one of the houses since Sunday evening in case the suspect in the first fatal shooting they discovered returned to them. When no one showed, deputies finally went to the door of one of the houses. No one answered so they crossed the street to the other house, which they knew was linked to the first house and found the first bodies. Jungles didn't offer any further details.