The Meteorology, Climatology, and Geophysical Agency (BMKG) detected a tsunami around 21:27 local time (14:27 UTC) at the western coast of Banten, even though the agency had not detected any preceding tectonic events. The Indonesian National Agency for Disaster Countermeasure (BNPB) spokesman Sutopo Purwo Nugroho said, Dozens of buildings were destroyed by the wave, which hit beaches in Lampung and Banten about 21:30 local time (14:30 UTC) on Saturday. According to The Jakarta Post, authorities said that the tsunami may have been triggered by an abnormal tidal surge due to a full Moon and an underwater landslide following the eruption of Anak Krakatau. The Agency initially refused to label the event as a tsunami, claiming that it was a normal high tide and that no tsunami had occurred on the coast of Banten.