Mount Lewotobi Laki Laki in Indonesia erupted twice on Monday, launching volcanic materials up to 18 km into the sky and covering villages with ash. The eruptions caused flight cancellations and heightened evacuation warnings.

Indonesia’s rumbling Mount Lewotobi Laki Laki erupted Monday, sending a column of volcanic materials as high as 18 kilometers (11 miles) into the sky and depositing ash on villages.

The ash cloud above Mount Lewotobi Laki-laki on Monday was about four times taller than the one produced by an eruption there last month.