WPTF 680 AM radio news just reported that the mercury came from a man who gave the mercury in containers to four students ? in a church. One told his parents, which is how authorities found out. The four students’ homes have been sealed.

ABC-11 Eyewitness News says “Investigators suggest a student may have brought the mercury to the school in a water gun.”

Davis Library at UNC-Chapel Hill has been given the all-clear and been reopened.