Mourners 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.