A California middle school shooting that left one person in critical condition and four others with injuries was apparently unintentional, according to police.

NBC reports that a 12-year-old female student was arrested for a shooting inside the Sal Castro Middle School on Thurs. morning that left a boy, 15, shot in the head with critical injuries, and four others with less severe injuries. The suspect was taken to a local juvenile hall and charged with negligent discharge of a firearm.

An unharmed student, Jordan Valenzuela, who was in the class with the suspect when the incident occurred, said that she started sobbing after the gun fired and claimed, “I didn’t mean it.” Valenzuela said the girl told him that the gun fired when she accidentally dropped her backpack.

Another fellow student, Benjamin Urbina, also said the girl didn’t intentionally hurt anyone. According to NBC, Urbina said the girl thought she had a toy gun in her backpack.

Authorities released a statement on Fri. morning, indicating that they believe the shooting was accidental, although an investigation is still going.

“This continues to be an active investigation,” a spokesperson for the LAPD said. “However, at this time, the information suggest that this was an isolated incident, involving the negligent discharge of a firearm, where innocent children and a staff member were unfortunately injured.”

The story continues to develop. Check back with CrimeOnline as additional details become available.

[Feature Photo: AP/Damian Dovarganes]