A 2-year-old Arizona boy was hospitalized in serious condition after shooting himself in the face with a gun that police said may have been hidden under a pillow on a bed.

Police said foul play is not suspected in the incident but that they're still trying to determine exactly what happened.

According to police, the shooting occurred Thursday night while the Peoria boy and a 7-year-old brother were being watched by a grandmother and aunt.

Police spokesman Jay Davis says initial information indicates the grandmother was playing with the boy near the bed when he grabbed the gun and shot himself.

It's unclear who the gun belongs to or if anyone will face charges.

The boy's father was not home at the time.

No identities were released.