Pictures shows apiarist Herbert Grafl, undated. The head of a beekeeping association in eastern Austria has admitted he is "concerned" about the appearance of Asian hornets in the region. (NewsX/Bee)
Oliver Wieckhorst speaks in undated footage. He is closely monitoring the situation for NABU, a German organisation focusing on the protection of the environment. (NewsX/Bee)
Picture shows Prof Daniel Cherix from Lausanne University, undated. He said there had been more than 30 reports about Asian hornet (Vespa velutina) occurrences so far this year. (NewsX/Bee)