Police released a composite sketch of the man they're looking for.
Authorities said at around 6 a.m. Thursday morning, the suspect approached a 15-year-old girl as she walked to school.
The man came up from behind and grabbed the girl by the arm. She defended herself and was able to pull away.
A driver noticed the end of the altercation and stopped to check on the victim.
The man took off.
Anyone with information was urged to call San Jacinto police at (951) 487-7368.