BBC: Experts from the European Union are to begin work in Hungary to tackle the toxic sludge spill that has claimed seven lives and devastated large areas. The civil protection unit will work on restoring affected areas and assessing further risks. The main concern is how to lessen the impact of a new burst in the reservoir, which officials say is inevitable. A protective ring of rock and earth is hurriedly being built to try to beat the expected next torrent. In …