Five firefighters and two other rescue workers died Wednesday as they tried to put out a warehouse fire in Buenos Aires. According to dpa, nine rescue workers also suffered serious injuries when the walls of a bank documents warehouse that was in flames collapsed, Argentine Security Secretary Sergio Berni said."The rescue in the rubble was very difficult," Emergency Services director Alberto Crescenti said. "We tried to get them out alive, but it was impossible."The warehouse reportedly belongs to the US-based firm Iron Mountain, which manages, scans and digitalizes documents.The cause of the fire is under investigation.