Tyler Kost, 18, was being held without bond after being arrested on Thursday, suspected of assaults on high school students between early 2011 and last month, the sheriff's office said.
One of the alleged victims was 13 years old, it said.
"Tyler Kost was a predator who threatened, harassed, stalked and then either forcibly sexually abused or sexually assaulted his victims," Sheriff Paul Babeu said in a statement.
Kost's attorney did not immediately respond to requests for comment. A media report said the attorney had unsuccessfully sought a gag order against the sheriff for what he argued were damaging comments about Kost, of San Tan Valley.
He was described "from all of the accounts of the victims, as somebody who was highly manipulative, very charismatic and charming in how he presented himself and then things obviously turned," Babeu told reporters on Friday.
© Thomson Reuters 2014
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An Arizona teen is accused of multiple sex crimes against 13 girls in the Nearly all of the victims are high school students, Tyler Kost, 18, of San Tan
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