East Java's Mount Bromo, in the distance, is one of three Indonesian volcanoes that are alert status due to increased activity. Mount Semeru can be seen smoldering in the foreground.

Mount Talang in West Sumatra, Mount Bromo in East Java and Mount Karang Etang in North Sulawesi are all exhibiting dangerous activity. Mt. Talang was the latest to be put on alert as dark clouds billowed from its crater. The volcano spewed hot ash and magma on Wednesday, but scientists said a major eruption was not imminent and villagers did not need to be evacuated.

The alert status in Mount Bromo was increased on Sept. 5 and Mt. Karang Etang received the alert status a month earlier, according to reports by the Antara news agency.

The government has only recently lowered the danger status of Java's Mt. Merapi, one of the most active volcanoes in the world.