Two people were killed and many more injured when a crush of patrons thronged a rock concert in Argentina early Sunday, officials said. Authorities said some 250,000 people attended the open air concert featuring the popular singer Indio Solari and his band in the town of Olavarria, a suburb of Buenos Aires. The local health minister for the town, German Maroni, said 10 people had been admitted to an area hospital, including a woman being treated in the intensive care unit.