A volcanic eruption in Indonesia sent an enormous ash cloud more than six miles into the sky, disrupting or canceling dozens of flights to and from the tourist island of Bali.

Indonesia’s Mount Lewotobi Laki-Laki erupted 50 times in two hours, spewing ash 10 km high and prompting the highest alert level. Flights to Bali and Flores were disrupted as authorities responded to ongoing seismic activity.

Several flights to the Indonesian resort island of Bali were cancelled or delayed and the airport in Maumere in East Nusa Tenggara province was closed due to the eruption of Mount Lewotobi Laki-laki,