Japanese school children wear face masks as they leave the Japanese International School together with their parents in a suburb of the western German city of Duesseldorf June 11, 2009. German authorities have confirmed 30 cases of the H1N1 flu at the school in Duesseldorf, the most concentrated outbreak of the virus so far in Europe's largest economy. The school has been closed until the end of next week, said Hiromi Kida, a senior official at the school. Duesseldorf is home to a large Japanese community. [Agencies]