3 teens arrested after social media school threats

PLEASANT HILL, Iowa (AP) - Three Southeast Polk students have been arrested on charges of threat of terrorism, harassment, and intimidation with a dangerous weapon after threats were posted on a social media site leading to increased security at the school for days.

Pleasant Hill police spokesman Adam Choate says two boys aged 16 and one aged 13 were arrested Friday. One of the 16-year-olds also is charged with threatening the use of an explosive device.

Their names have not been released.

Choate says interviews with students, tips and computer addresses obtained from the Yik Yak social media application led them to the three. Yik Yak lets users post anonymous messages to others in their immediate location.

A series of threats against Southeast Polk High School were posted over several days prompting increased school security.