Corona police arrested 22-year-old Steven Martinez of Norco on Monday. Martinez worked as an instructional aide with the Corona Norco Unified School District.
Police say he had befriended the girl and started communicating with her on social media sites before the alleged assault took place.
Detectives say he also sent inappropriate text messages to her. The girl's parents saw the messages and called police. Martinez is behind bars on $1 million bail.
If you have any information about this case, you're urged to contact the Corona Police Department.