ANCHORAGE, Alaska — Short eruptions of an Alaska volcano sent up ash clouds in the Aleutian Islands.
The first eruption of Bogoslof (BOH-gohs-lawf) Volcano began at 5:47 p.m. Monday and lasted nine minutes.
The Alaska Volcano Observatory says a series of explosive events followed lasting 10 to 30 minutes.
They emitted volcanic clouds that rose to 25,000 feet (7,620 meters) and dissipated within 30 minutes.
The Aviation Color Code was raised to red or “warning” level.
Ash from Aleutian volcanos is a threat airliners operating between North America and Asia when a cloud rises above 20,000 feet (6,096 meters).
The observatory says the last pulse of activity ended at 8:35 p.m.
Bogoslof has erupted periodically since mid-December.
The observatory says additional explosions producing high-altitude volcanic clouds could occur at any time.