An eruption could be imminent at a volcano belching huge plumes of smoke on Indonesia's resort island of Bali, officials warned Monday, as they raised the alert to the highest level and increased the exclusion zone.Huge plumes of smoke have been pouring out of Mount Agung since Tuesday and senior state volcanologist Gede Suantika said it was belching thick grey smoke more than two miles (three kilometers) into the sky early Monday."The volcano's alert level has been raised to t