A volcano in Indonesia's eastern island of Halmahera erupted on Saturday spewing a five-km (3-mile) high ash cloud, the country's volcanology agency (PVMBG) said, while its disaster agency warned of potential flash floods and cold lava flow. The eruption of Mount Ibu at 11:03 a.m. (0203 GMT) follows a series of eruptions in May, after authorities noticed an uptick of volcanic activity starting in April, leading to the evacuation of seven nearby villages.