SILVER SPRING, Md. (WUSA9) -- Metro Transit Police have arrested a registered sex offender who they say exposed himself to an eight-year-old girl on a Metrobus.

Police say 48-year-old Mario Amaro was riding a Y8 but en route to Silver Spring when on the afternoon of July 9 when the incident occurred.

The incident was reported to Metro Transit Police by the girl's mother. Two days later, the girl was traveling on the same bus route with her mother when she saw the suspect again and pointed him out.

Police say the girl's mother took a picture of the suspect and gave it to police, who identified Amaro after looking on the Maryland Sex Offender Registry. Amaro was arrested in 2011 for inappropriately touching a seven-year-old girl.on two separate occasions.

The victim was able to positively identify Amaro in a photo array, according to police.

Amaro was arrested by the Metro Transit Police Warrant Squad at his home Thursday morning. Clothing matching what he was wearing aboard the bus was also taken as evidence.

Amaro will face charges in Maryland District Court of Montgomery County.

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