Police urge residents to stay calm and wear masks as volcanic ash from Mount Anak Krakatau reaches Jakarta and surrounding areas.

Mount Anak Krakatau has erupted since late on Friday, with volcanic ash disrupting hundreds of flights as Indonesia faces a string of natural disasters across the archipelago.

The suspension of flight operations at Soekarno-Hatta International Airport, extended several times, has affected more than 900 flights, according to Indonesia's transportation…