Alert level raised for Alaska volcano after explosion observed

By Brendan O'Brien (Reuters) - A remote Aleutian volcano erupted on Tuesday sending a cloud of ash into the air and forcing scientists to raise alerts to the highest levels, a monitoring website said. Pilots reported a short-lived explosive eruption and an ash cloud rising to about 34,000 feet (10 km) above the Bogoslof Volcano about 4 p.m. local time, the Alaska Volcano Observatory said on its website. About an hour later, another pilot reported activity at the 492-foot (150 m) Bogoslof Volcano