UPDATE 3:15 a.m.: Fishermen reportedly heard a loud bang over Belitung Island between 7 and 8 a.m., the
International Business Times reported, citing Indonesian website Bangka Tribun News.
Belitung is an island on the east coast of Sumatra, Indonesia, in the Java Sea, IBT noted.
The fishermen who were at sea engaged in their regular fishing activities near Coconut Island also claimed that the explosion was quite powerful, the outlet added.