A lady lies a flower at the entrance of Sint-Lambertus primary school in Heverlee of Lueven, Belgium, in memory of victims of the bus crash that killed 22 children on March 14, 2012. Twenty-eight Belgians, including twenty-two children from two schools in Lommel, and Heverlee of Lueven in Belgium, were killed in a serious bus accident that occurred in southwest Switzerland on Tuesday night. [Xinhua]