Clouds of ash blew far north of the Philippines' Taal volcano, reaching Manila, the country's bustling capital, and forcing the shutdown of its main airport after lava gushed out of the mountain on Monday. Thousands of villagers were fleeing to safety, but officials say the number could swell to hundreds of thousands. Poor visibility and a lack of transportation were hampering people's efforts to leave. There have been no reports of casualties or major damage from the eruption, but experts warned that it could worsen. Taal, one of the world’s smallest volcanoes, is among two dozen active volcanoes in the Philippines, which lies along the Pacific “Ring of Fire,” a seismically active region that is prone to earthquakes and volcanic eruptions.

In this Jan. 12, 2020, photo, Taal volcano releases ash and smoke during an eruption in Tagaytay, Cavite province south of Manila, Philippines. (AP PhotoBullit Marquez)

In this Jan. 12, 2020, photo, Taal volcano releases ash and smoke during an eruption in Tagaytay, Cavite province south of Manila, Philippines. (AP PhotoBullit Marquez)

In this Jan. 12, 2020, photo, plumes of smoke and ash rise from as Taal Volcano erupts in Tagaytay, Cavite province, outside Manila, Philippines (AP PhotoAaron Favila)

In this Jan. 12, 2020, photo, plumes of smoke and ash rise from as Taal Volcano erupts in Tagaytay, Cavite province, outside Manila, Philippines (AP PhotoAaron Favila)

A man walks through thick ash on a road from Taal volcano in Lemery, Batangas, southern Philippines on Monday, Jan. 13, 2020. (AP PhotoAaron Favila)

A man walks through thick ash on a road from Taal volcano in Lemery, Batangas, southern Philippines on Monday, Jan. 13, 2020. (AP PhotoAaron Favila)