A 12-year-old girl was forced to perform oral sex on a man who wore a mask, China Press reported.
The incident happened at a prayer room in Ampang, Kuala Lumpur, about noon on Dec 3.
The suspect had allegedly threatened the girl with a pistol and molested her before forcing her to perform oral sex.
He warned the girl not to tell others before letting her go.
Her parents were shocked when they heard what happened to their daughter, who had acted "strangely" after the incident. A police report has been lodged and police are on the hunt for the suspect.