The police have cordoned off the area

Does "the area" refer to the place where the terrorist attack happened"? Or does it refer to the school or the class where the teacher taught?

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Paris teacher beheaded for showing Prophet Mohammed's cartoon in class; killer shot by police
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The deceased teacher had reportedly invited Muslim students out of the class before showing the Prophet's cartoon, which had drawn massive criticism and killings from five years ago. But reportedly a young girl, possibly a Muslim, stayed behind by mistake and later told her parents about her class 10 days ago. The head of parent-teacher association at the Bois-d'Aulne College, Rodrigo Arenas confirmed of a legal complaint by an angry parent soon after the incident, Daily Mail reported.

The police have cordoned off the area, bombs squads were deployed after possible bomb threat and President Emmanuel Macron visited the scene on Friday evening.

Source: https://www.ibtimes.co.in/paris-teacher-beheaded-showing-prophet-mohammeds-cartoon-class-killer-shot-by-police-829402