SANTA CLARA — An East Bay woman suspected of using a stun gun on a 16-year-old girl at Great America is the second person arrested following an outbreak of violence at the theme park’s Halloween Haunt event on Saturday night that saw scores of people assaulted and robbed.

Leticia Saxton, 44, of El Sobrante was arrested Wednesday in Hayward and booked into Santa Clara County jail on three felony counts, including corporal injury to a child, assault causing bodily injury, and assault with a stun gun, Santa Clara police Lt. Dan Moreno said.

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Saxton’s teen daughter was in an altercation with the 16-year-old girl when Saxton intervened and used the stun gun on her, Moreno said. The two girls attend the same East Bay high school.

Although there were metal detectors at Great America that night, police note they are not foolproof.

“Obviously they missed it,” Moreno said.

As of Thursday, Santa Clara police have taken 20 reports from the crime spree that may have involved as many as 20 teens attending the park’s 10th annual Halloween Haunt. The Saturday night skirmishes yielded reports of 15 thefts — ranging from strong-arm robberies to purse snatchings and the like — four assaults, and one instance of public intoxication.

Moreno said six people were treated at the scene for assorted minor injuries including bloodied noses, bumps, bruises and scrapes. Two teens, a boy and a girl, were taken to local hospitals by their parents for precautionary evaluation.

Moreno said detectives have been following up on several leads and are making progress in identifying additional suspects.

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Saturday night, a teen was arrested at the park on suspicion of theft. Park visitors reported seeing other suspects elude capture by getting into waiting cars.

“We were disappointed and surprised by the events that occurred,” Moreno said.

Santa Clara police said the mayhem broke out about 10:30 p.m. Saturday at Halloween Haunt, which helped attract upward of 20,000 visitors to the park; the weekend before Halloween is typically the busiest of the year for the October festivities.

Investigators believe that a group of between 15 and 20 teen boys were responsible for the attacks, robberies, and thefts, but have not determined how they were affiliated.