SERANG, Banten (Antara): Mount Krakatau volcanic activity has increased over the past three days, prompting authorities to raise its status.

The volcano had produced 20 tremors and released 80-meter to 200-meter-long white-grey smoke plumes every hour from Oct. 24 to Oct. 26, Sigin, a monitoring officer , said Friday.

Normally, the volcano produced only five tremors per hour but since last Wednesday the frequency of tremors had increased, he said. Consequently, tourists and fishermen had been warned not to come near the volcano. (***)