The Story County attorney's office has dismissed charges against two teenagers accused of a sexual assault in July.
The county attorney filed documents Monday dismissing the case against the 16-year-old boys from Ames and Boone.
Charges were filed after a 17-year-old Hamilton County girl claimed she was abducted from her backyard and raped in an Ames park.
Lawyer Peter Berger, who represents one of the boys, says the charges were dropped after a videotape showed they were at a different location when the alleged assault occurred.
Charges remain against 20-year-old Mason Reilly of Ames, but his case is on hold pending a determination of whether he's competent to stand trial. Attorney Sean Spellman claims Reilly can't assist in his defense due to fetal alcohol syndrome.