Indonesia on Thursday raised the danger alert level for an erupting volcano that sparked a killer tsunami at the weekend, after previously warning that fresh activity at the crater threatened to trigger another deadly wave.
Authorities also widened a no-go zone around rumbling Anak Krakatoa to five kilometres (three miles) -- up from a previous two kilometres -- and warned shell-shocked residents to stay away from the coast, after more than 400 were killed by Saturday night's killer wave.
Plumes of ash burst into the sky as pyroclastic flows -- hot gas and other volcanic material -- flowed down the crater, threatening anyone too close to the volcano and raising the risk of rough seas for boats in the vicinity. "There is a danger of more eruptions," said national disaster agency spokesman Sutopo Purwo Nugroho.