The volcano is sending clouds of gray soot and debris up to four miles in the air.
The eruption forced President Barack Obama to cut short his visit to Indonesia by several hours.
Meanwhile, the death toll from Friday's big eruption has climbed to 191. Officials said earlier figures did not take into account those who died of respiratory problems, heart attacks and other illnesses linked to the volcano.
Also, another 600 have been hospitalized, some with burns covering 95 percent of their body.
More than 340,000 people living along the volcano's slopes have been evacuated since the mountain roared back to life two weeks ago. The displaced are now living in more than 80 government camps.
The Associated Press contributed to this report.