Serie of vandalism against schools

GRACE-HOLLOGNE - Unknown persons put on fire garbage containers next to a school. Firemen put out the fire limiting the damages to the building (17.05.2010)
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KEERBERGEN - All the locks of a school were glued, obstructing the teachers and pupils to enter the school. (18.05.2010)
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WILSELE - Unknown persons tried to put fire to a school. Damage was limited. (18.05.2010)
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ROTSELAAR - Windows of a school were broken by unknown persons (19.05.2010)

[All info comes from the regular media)