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Open Image ModalChildren cry as they attend a memorial service outside of the Soeverein Arena in Lommel, Belgium on Wednesday, March 21, 2012. Thousands of mourners are attending a memorial service for victims of last week's bus crash in a Swiss tunnel that killed 22 children and six adults. Under a sparkling sky, a solemn procession Wednesday carried the coffins of one teacher and 14 schoolchildren who came from 't Stekske school in northern Belgium, one of two schools whose students were returning from a traditional "snow class" vacation in Switzerland for 12-year-olds March 13 when tragedy struck. (AP Photo/Ermindo Armino) (credit:AP)
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Open Image Modal (credit:AP)
(03 of10)
Open Image ModalMourners watch a memorial service on a video screen outside of the Soeverein Arena in Lommel, Belgium on Wednesday, March 21, 2012. Thousands of mourners are attending a memorial service for victims of last week's bus crash in a Swiss tunnel that killed 22 children and six adults. Under a sparkling sky, a solemn procession Wednesday carried the coffins of one teacher and 14 schoolchildren who came from 't Stekske school in northern Belgium, one of two schools whose students were returning from a traditional "snow class" vacation in Switzerland for 12-year-olds March 13 when tragedy struck. (AP Photo/Ermindo Armino) (credit:AP)
(04 of10)
Open Image ModalMourners watch a memorial service on a video screen outside of the Soeverein Arena in Lommel, Belgium on Wednesday, March 21, 2012. Thousands of mourners are attending a memorial service for victims of last week's bus crash in a Swiss tunnel that killed 22 children and six adults. Under a sparkling sky, a solemn procession Wednesday carried the coffins of one teacher and 14 schoolchildren who came from 't Stekske school in northern Belgium, one of two schools whose students were returning from a traditional "snow class" vacation in Switzerland for 12-year-olds March 13 when tragedy struck. (AP Photo/Ermindo Armino) (credit:AP)
(05 of10)
Open Image ModalChildren cry as they attend a memorial service outside of the Soeverein Arena in Lommel, Belgium on Wednesday, March 21, 2012. Thousands of mourners are attending a memorial service for victims of last week's bus crash in a Swiss tunnel that killed 22 children and six adults. Under a sparkling sky, a solemn procession Wednesday carried the coffins of one teacher and 14 schoolchildren who came from 't Stekske school in northern Belgium, one of two schools whose students were returning from a traditional "snow class" vacation in Switzerland for 12-year-olds March 13 when tragedy struck. (AP Photo/Ermindo Armino) (credit:AP)
(06 of10)
Open Image ModalIn this photo released by the Belgian Department of Defense, coffins of children and teachers who were killed in a deadly bus crash in Switzerland are displayed at a hangar, at the military airport of Melsbroek, Belgium, Friday, March 16, 2012. A coach accident in Switzerland left 28 dead, including 22 children traveling home after a skiing holiday. (AP Photo/Belgian Defense Department) (credit:AP)
(07 of10)
Open Image ModalA convoy of hearses leave the military airport of Melsbroek, Friday 16 March 2012. Belgium held a day of national mourning Friday for the 28 people who died in a school bus crash in Switzerland while Swiss authorities investigated whether the design of the tunnel contributed to the disaster. (AP Photo/Geert Vanden Wijngaert) (credit:AP)
(08 of10)
Open Image ModalChildren look from behind a memorial fence for victims of a bus crash at 't Stekske in Lommel, Belgium on Friday, March 16, 2012. A coach accident in Switzerland left 28 dead, including 22 children from Belgium traveling home after a skiing holiday. Belgium holds a national day of mourning on Friday. (AP Photo/Virginia Mayo) (credit:AP)
(09 of10)
Open Image ModalA view seen from a car as it travels through the tunnel directly ahead the accident site on Thursday March 15, 2012, where a tourist bus from Belgium crashed in a tunnel of the motorway A9, in Sierre, western Switzerland Tuesday. Twenty-eight people, including 22 children, returning to Belgium from a skiing holiday died in a bus accident in Sierre. (AP Photo/ Keystone/Olivier Maire) (credit:AP)
(10 of10)
Open Image ModalPeople light candles during a memorial service at the 't Stekske school in Lommel, Belgium on Thursday, March 15, 2012. A coach accident in Switzerland on Wednesday left 28 dead, including 22 children from Belgium traveling home after a skiing holiday, local police said Wednesday. Police said 24 children were injured when their Belgian bus crashed into the wall of a motorway tunnel near Sierre, south of Bern, late Tuesday. The cause of the crash on the straight stretch of road was not immediately clear. (AP Photo/Virginia Mayo) (credit:AP)