A 15-year-old former student fatally stabbed a 37-year-old school caretaker and injured two other staff members at the John Paul II Primary School in Leszczydół-Nowiny near Wyszków on Thursday morning.

Police said the attacker entered the school around 9 a.m. armed with a sharp object and assaulted three employees. The school's principal subdued the suspect, who was then detained by officers arriving minutes later. Despite resuscitation efforts, the caretaker could not be saved, according to Masovian police.

The other victims included a teacher and the principal. The incident marks the second school attack in Poland within two days.

On Wednesday, a 19-year-old student used a machete to injure nine people at a vocational school in Ostrołęka, about 60 kilometers away. Those injured included five students, two teachers, and two bystanders. The suspect, who also harmed himself, was arrested shortly after the attack. Authorities later found a homemade explosive device in his backpack that nearly detonated.

In a separate development, police detained a 17-year-old in Sierpc who had planned an attack and carried two knives in his backpack.

Prime Minister Donald Tusk scheduled an urgent meeting for Thursday afternoon to address rising violence in schools. Interior Minister Marcin Kierwiński described having only partial information on the latest incident.

Social media speculation following the Ostrołęka attack suggested the perpetrator might be Ukrainian, but officials confirmed he was Polish. Poland hosts a large number of Ukrainian refugees and migrants.

The attacks have raised concerns about school security and youth violence in the country. All three suspects are Polish nationals, and investigations into motives continue.