Worries that volcanic ash drifting across Indonesia might ground Air Force One have forced President Obama to cut short his visit to the Indonesian capital of Jakarta today. His departure was moved up by two hours.
Images of the ash leave no doubt that this is a serious eruption. It has killed 130 people and forced 300,000 more to flee. Airline schedules in the region have been disrupted by cancellations. Airborne ash sucked into jet engines can cause damage and shut them down.
(PHOTOS: Reuters)