An Illinois mother and her 5-year-old twin daughters are dead in an apparent murder-suicide that has shocked their suburban neighborhood and left a father and husband grieving.

CBS Chicago reports that Celisa Henning, 41, and her 5-year-old twin daughters, Addison and Makayla, were discovered dead in their suburban Joliet home Monday afternoon.

According to People magazine, Henning’s husband came home to find his family dead at around 3 p.m. Monday. He reportedly had trouble reaching his wife throughout the day.

The Will County Coroner’s Office told People that the twin girls had multiple gunshot wounds to the head and that Celisa died of a single gunshot wound to the head.

A motive for the apparent murder-suicide is not yet known.

“We really don’t know why someone would kill their two lovely children like that and turn the gun on themselves,” Joliet Deputy Police Chief Al Roechner told People. “It’s really hard, because you wish you could have stopped it from happening.”

The girls’ father has not yet commented on the tragedy, but his own father told the Daily Southtown that Celisa was “disturbed.” Still, Roechner told People that there were no records of previous mental health issues.

“There were no previous indicators that there was cause for concern from our end,” Joliet Police Chief Brian Benton told ABC 7 Chicago. “I’m not sure what prompted this. But again, it’s a terrible tragedy and we are very sensitive to the concerns of the family.”

Feature photo: Facebook