Two handguns were seized from the bedroom of a teen who threatened a shooting at his suburban Philadelphia high school a week after a mass killing at a Connecticut elementary school, police said Friday. Also Friday, a 16-year-old student in southern Michigan was arrested after authorities said he threatened a teacher in an online posting.

In the Pennsylvania case, the Council Rock South High School ninth-grader was taken into custody Thursday after students said he made threatening statements, Northampton Township police said.