Dutch Prince Willem Alexander and Princess Maxima attend a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012, for victims of a bus crash in the Swiss Alps, which killed 22 children and six adults.
Belgium's King Albert II, left, and Queen Paola, right, arrive for a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012 for victims of a bus crash in the Swiss Alps which killed 22 children and six adults.
From left, Dutch Prince Willem Alexander, Swiss President Eveline Widmer-Schlumpf, and Belgium's King Albert II attend a memorial service at the Soeverein Arena in Lommel, Belgium on March 21, 2012. Mourners and family members honored the victims of a bus crash in the Swiss Alps which killed 22 children and six adults.
Belgian soldiers carry a coffin during a memorial service at the Soeverein Arena in Lommel, Belgium on March 21, 2012.
Mourners attend a memorial service outside of the Soeverein Arena in Lommel, Belgium, on March 21, 2012. Thousands of mourners paid tribute at a memorial service for victims of last week's bus crash in a Swiss tunnel.
From left, Dutch Prime Minister Mark Rutte, Dutch Princess Maxima, Dutch Prince Willem Alexander and Belgium's Prime Minister Elio Di Rupo arrive for a memorial service at the Soeverein Arena in Lommel, Belgium on March 21, 2012.
Dutch Prince Willem Alexander, center, greets officials as he arrives for a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Belgium's King Albert II, second right, and Belgium's Queen Paola, right, file by coffins during a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Children cry as they attend a memorial service outside of the Soeverein Arena in Lommel, Belgium, on March 21, 2012, for victims of last week's bus crash in a Swiss tunnel.
Belgian soldiers carry a coffin during a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
A girl dances near coffins during a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Belgian King Albert II and Queen Paola participate in a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Family and relatives speak during a remembrance service at the Soeverein hall in Lommel on March 21, 2012.
From left, Queen Paola of Belgium, Dutch Princess Maxima, Dutch Prince Willem Alexander and Swiss President Eveline Widmer-Schlumpf participate in a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Belgian King Albert II, left, Lommel Mayor Peter Vanvelthoven, center, and Queen Paola of Belgium walk on March 21, 2012, outside the Soeverein Arena in the northern Belgian town of Lommel during the memorial service for bus-crash victims.
Lommel Mayor Peter Vanvelthoven and Queen Paola of Belgium speak on March 21, 2012, outside the Soeverein Arena in the northern Belgian town of Lommel.
Belgium's Prime Minister Elio Di Rupo bows his head during a memorial service at the Soeverein Arena in Lommel, Belgium, on March 21, 2012.
Princess Maxima of the Netherlands stands next to Belgian Prime Minister Elio di Rupo on March 21, 2012, at the Soeverein Arena in the northern Belgian town of Lommel.
Belgian pop group Clouseau performs on March 21, 2012, at the Soeverein Arena in the northern Belgian town of Lommel during thememorial service for Swiss Tunnel crash victims.
King Albert II, left, of Belgium, Queen Paola, center, of Belgium and Princess Maxima of the Netherlands attend a memorial service on March 21, 2012, at the Soeverein Arena in the northern Belgian town of Lommel.
A family member places a red flower in a yellow heart during a memorial service at the Soeverein Arena in Lommel, Belgium on Wednesday, March 21, 2012.
Princess Maxima of the Netherlands wipes away tears on March 21, 2012, at the Soeverein Arena in the northern Belgian town of Lommel during the memorial service for young bus-crash victims.