On Thursday, a man approached a Chicago restaurant and opened fire, killing four men in what police have described as gang-related retaliation.

The mother of two of those men was standing just nearby working at the Nadia Fish and Chicken restaurant when it happened.

“I can’t go on, my life is over. I’m ‘bout to … kill myself,” said the mother of Dillon and Raheem Jackson in speaking to the Chicago Tribune. “I was standing right here in the window, they killed ‘em right in front of me.”

No arrests have been made, but the shooting is believed to have been a retaliation “from another incident,” a NBC affiliate reported.