DEERFIELD TWP., Warren Co. (AP) — A woman accused of stabbing her 3-year-old neighbor as he walked with an older sibling to a school bus stop has been charged with felonious assault, authorities said.

It’s still not clear what prompted the attack, which occurred around 8:45 a.m. Thursday in Deerfield Township. Authorities said Xiaoyan Zhu, 46, ran from her home to the child’s house and used a ceramic knife to stab him three times in his neck and back.

The knife broke during one of the stabs, which lodged its tip inside the boy, who is expected to recover from his injuries. The boy’s older sibling was not injured.

The children’s mother was with another sibling when the attack occurred, authorities said, and she called 911 when she realized what had happened.

Zhu’s teenage daughter was home and attending classes online when she told her teacher about the stabbing, officials said. The teacher immediately called 911, and Warren County Sheriff’s deputies soon arrived on scene.

Zhu was taken to a hospital for an evaluation and remained there Friday, authorities said. It wasn’t known if she has retained an attorney, and authorities said she could face additional charges.