Sicily’s Mount Etna erupted on Monday, producing an enormous ash cloud “several kilometers high.” The eruption began at 11:24 a.m. local time, according to reports. Italy’s National Institute of Geophysics and Vulcanology warned of “almost continuous” explosions that were of “increasing intensity” caused by a section of Etna’s southeast crater crumbling.

A massive volcanic eruption occurred at Mount Etna on the Italian island of Sicily on Monday, shooting massive ash plumes into the air.