Letter from Northern Ireland Teachers' Council to Arlene Foster (FM) and Michelle O'Neill (DFM) regarding urgent action to address the increasing concern around the safety of pupils and all school staff in the face of the pandemic, dated 17/03/2020. (Michelle O'Neill's WhatsApp messages with Carol Morrow INQ000308535, dated between 13/01/2020 and 17/07/2020)