Four people were killed and five were injured in a stabbing attack in Rockford, Illinois.

The suspect was taken into custody shortly after the attack occurred, police said. Winnebago County Sheriff Gary Caruana said that the attack started as an apparent home invasion, during which a woman who attempted to flee was stabbed in the face and hands. A passerby who attempted to help was stabbed as well.

One of those killed was a postal worker. Not all victims were stabbing victims, though there were no gunshot victims.

Police said they didn’t have a clear motive. Four of the injured are in stable condition, while a fifth is in critical condition, that being the woman who attempted to flee. One of those in stable condition is the passerby who intervened to help.

Police said the attack was a “multijurisdictional event.” Federal agencies are involved in the investigation.

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Rockford Mayor Tom McNamara expressed his condolences to those affected by the attack.

“I think, like most Rockfordians, I’m just totally shaken by this act of violence and the impact that it’s having now on multiple families’ lives,” he said at a press conference. “So certainly my prayers are with them as they’re just beginning to deal with what will be really difficult days and weeks ahead.”