Indonesia has widened the no-go zone around an island volcano that triggered a tsunami on the weekend, killing at least 430 people in Sumatra and Java.

The country’s volcanology agency said Thursday that the Anak Krakatau volcano’s alert status had been raised to the second highest level and the exclusion zone more than doubled to a 5-kilometer (3-mile) radius.

The eruption on Saturday evening caused part of the island in the Sunda Strait to collapse into the sea, apparently generating tsunami waves of more than 2 meters (6 1/2 feet).

The government has warned Sunda Strait communities to stay a kilometer (less than a mile) away from the coastline because of the risk of another tsunami.

Un soldado indonesio camina cerca de los escombros de una zona que fue azotada por un tsunami en Carita, Indonesia, el miércoles 26 de diciembre de 2018. (AP Foto/Achmad Ibrahim)
Un soldado indonesio camina cerca de los escombros de una zona que fue azotada por un tsunami en Carita, Indonesia, el miércoles 26 de diciembre de 2018. (AP Foto/Achmad Ibrahim)
This combination of synthetic aperture radar images taken by JAXA's ALOS-2 satellite and analyzed by Geospatial Information Authority of Japan shows Indonesia's Anak Krakatau volcano, center in images, before and after the Dec. (Geospatial Information Authority of Japan via AP)
This combination of synthetic aperture radar images taken by JAXA’s ALOS-2 satellite and analyzed by Geospatial Information Authority of Japan shows Indonesia’s Anak Krakatau volcano, center in images, before and after the Dec. (Geospatial Information Authority of Japan via AP)
A tsunami survivor sits inside a tent at a makeshift hospital in Labuan, Indonesia, Wednesday, Dec. 26, 2018. (AP Photo/Fauzy Chaniago)
A tsunami survivor sits inside a tent at a makeshift hospital in Labuan, Indonesia, Wednesday, Dec. 26, 2018. (AP Photo/Fauzy Chaniago)
Residents, assisted by police officers, clean up debris from the ruin of a house at a neighborhood affected by Saturday's tsunami in Carita, Indonesia, Wednesday, Dec. (AP Photo/Fauzy Chaniago)
Residents, assisted by police officers, clean up debris from the ruin of a house at a neighborhood affected by Saturday’s tsunami in Carita, Indonesia, Wednesday, Dec. (AP Photo/Fauzy Chaniago)

Source: The Associated Press