Police in Upland are asking for the public's help in identifying a teenage male who has allegedly sexually assaulted at least 5 women.
The attacks occurred during several instances on Saturday between 4 and 8:30 p.m., Tuesday at 8:30 p.,. and Wednesday at 4:30 p.m. at a shopping center located in the 1600 block of North Mountain Avenue, the Upland Police Department said in a released statement.
Another attack also happened in the 1500 block of West 15th Street.
In the statement police described the incidents as "the suspect grabbing female victims' buttocks and grabbing the female victims by the hips from behind, and doing multiple pelvic thrusts against the victims' buttocks."
After the assault, police said the suspect flees on a bike without saying a word.
"Just walking up behind woman, you know, they're probably not paying attention to their surroundings," said Lt. Marcelo Blanco with the Upland Police Department. "He's grabbing their hips, their buttocks and then taking off running on the bike and riding away."
According to police, the teenage suspect targeted women in their 30s and younger who were wearing workout clothing or yoga-type pants.
One female resident in Upland told KTLA that the possibility of being attacked leaves her fearful in her own neighborhood.
"It terrifies me because I wouldn't want to be walking by myself. I'm glad they're with me" said Monia Karram about her friends who were accompanying her on a walk in Upland.
The suspect is described as a white or hispanic male, between the ages of 13 and 18, with dark brown, cropped hair, standing about 5 feet 6 inches tall with a thin build.
Police said that they are trying to determine whether the attacks may be a prank or something more sinister.
"That's the fear, you never know if it's a prank; if it's just kids in the sense of get something on social media or is it legitimately a sexual predator that will escalate from doing this," Blanco added.
The suspect's clothing description varied between the attacks, but police said he wore a camouflage hoodie in one incident.
The suspect's bike is described as a black, BMX style bicycle with a rectangular rear reflector.
Anyone with information is asked to call the Upland Police Department at 909-946-7624 or Detective Teague at 909-920-6529.
KTLA's Mariel Turner contributed to this article.