Mandurah detectives have charged a 35-year-old Wannanup man over an alleged child sex assault on a bus after he presented at the police station this afternoon.
Detective Senior Sergeant Trevor Troy said the man was charged with indecent dealing.
He is due to appear in the Mandurah Magistrates Court on November 30.
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Earlier this morning detectives called for witnesses of the incident or any information that could help.
Police allege about 4.35pm on Wednesday, October 3, 2018, a man sat down next to a 13-year-old girl and started a conversation, on a bus from Mandurah to Falcon.
The man sexually assaulted the girl before she screamed and was able to get away from him with the assistance of two passengers.