Residents of a small central Illinois city on Tuesday mourned the loss of three children and a teenager killed in a startling crash in which a car barreled through a building used for a popular after-school camp.

Axar.az reports, citing AP, authorities said it didn’t appear to be a targeted attack.

The car on Monday left a road, crossed a field and smashed into the side of the building in Chatham used by Youth Needing Other Things Outdoors, also known as YNOT, according to Illinois State Police. It traveled through the building, striking people before exiting the other side. Six children were also hospitalized, including one left in critical condition.

The Sangamon County coroner identified those killed as 18-year-old Rylee Britton of Springfield and three Chatham children: Ainsley Johnson, 8, and Kathryn Corley and Alma Buhnerkempe, both 7.

The driver, a 44-year-old Chatham woman, wasn’t injured but was taken to a hospital for evaluation. Police said toxicology reports were pending. She was not in custody on Tuesday. State police declined to offer further details, saying the crash remains under investigation.

“This does not appear to be a targeted attack,” state police said.