Per WRAL:
Hazardous materials crews in Durham are decontaminating a church, four residences, a school and a school bus in connection with a mercury scare that has closed an elementary school, and also temporarily shut down a UNC-Chapel Hill library.
Authorities said an air-conditioning technician passed out mercury to four children at a church on Ramseur Street in Durham. … Public health officials are expected to hold a news conference at 6 p.m. Thursday to discuss the ongoing investigation and to report on some early resting results. At a news conference held earlier Thursday, officials said the children sprayed the mercury on the hands of other children at the school. Those children, officials said were being interviewed and were also undergoing testing for possible contamination.