Toulouse, France, June 11: Eleven people were held for questioning on Tuesday in the investigation into last year's deadly explosion at a chemical factory in the southern French city of Toulouse, according to justice officials. The eleven were employees at the AZF factory or sub-contractors who worked at the site in the Toulouse suburbs before the September 21 blast, which killed 30 people and injured more than 2,000 others, the officials said. Last week experts delivered an initial report to the judges leading the investigation, in which they said the disaster was caused by a "chemical accident" and was not a deliberate act. Bureau Report