The attack happened at approximately midnight Saturday near the intersection of Tyler Avenue and Brockway Street in El Monte, police said.
The 18-year-old victim had been walking southbound on Tyler Avenue when the suspect ran up from behind, grabbed her and knocked the victim to the ground. The suspect then pulled the victim toward Brockway and out of view of nearby residences and traffic.
The suspect then attempted to sexually assault the victim, who fought back and struck the suspect multiple times in the face. The suspect punched the victim at least one time in the head, but she was able to escape.
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Video surveillance captured parts of the assault and an image of the suspect's vehicle. The vehicle is described as a white or light-colored four-door compact car.
A composite sketch of the suspect was also released. He is described as being between 30 and 40 years old, Hispanic, 5 feet, 7 inches tall and about 190 pounds. He has brown eyes, was clean shaven and was wearing a light blue long-sleeve shirt and dark jeans.
Anyone with information regarding the incident is asked to contact the El Monte Police Department at 626-258-8635.