Investigation into attempted murder of 9 in Ostrołęka; attack prevented in Sierpc

The Regional Prosecutor's Office in Ostrołęka has taken over an investigation into the attempted murder of nine people at a school there; seven wounded have already returned home. Minister Marcin Kierwiński reported that police thwarted a knife attack at a school in Sierpc, Mazovia, the previous day — police found two knives on a 17-year-old student.