Following a knife attack by a 19-year-old at a school in Ostrołęka, Polish prosecutors have launched an investigation into attempted murder of nine individuals. Prosecutor Dariusz Korneluk reported to TVN24 that the suspect’s backpack, left in the computer lab, contained a homemade explosive device. A teacher first noticed smoke emanating from the backpack, prompting authorities to investigate further. The charges against the young perpetrator are likely to be expanded as the investigation progresses. The incident has prompted a major response from law enforcement in Ostrołęka and surrounding areas. Authorities are working to determine the motive for the attack and to ensure the safety of students and staff. The discovery of the bomb adds another layer of seriousness to the already grave situation.