Mount Merapi, one of Indonesia's active stratovolcanoes, sent up smoke into the air, and streams of lava were seen down the slope from its peak on August 15. /CFP

The 2,968-meter peak is near Yogyakarta, where hundreds of thousands of people live. /CFP

The mountain has seen increased volcanic activity since earlier this month. According to AP, the eruption sent hot ash 1,000 meters into the sky, and the smoke traveled up to 3 kilometers down the slopes several times. Villagers living nearby were advised to be aware of the danger posed by lava. /CFP

The last major eruption happed in 2010, killing over 330 people. /CFP