Peru’s typically snow-capped El Misti volcano, also known as Putina, is showing signs of awakening from a period of relative slumber that goes back to the 15th century.

While gas emissions have occurred since eruptions around 1440 and 1470, the volcano is now showing signs of rising magma.

El Misti is considered the most dangerous volcano in Peru, with about 1 million people around Arequipa under threat.