One of Indonesia's deadliest volcanoes began erupting Saturday, but there was no visual confirmation of activity because the peak was cloaked in dense fog, a senior government volcanologist said. Seismic readings showed Mt. Kelud was erupting, said Saut Simatupang, a leading scientist with Indonesia's Volcanology Center. The mountain was put on high alert several weeks ago and tens of thousands of people have been forced to evacuate the area, the Associated Press reported.