More than a dozen tourists were visiting the Sileri Crater area when it erupted at about midday, shooting cold lava, mud and smoke up to 50 meters into the air, state news agency Antara News said.

Four of the visitors were injured, it said.

Sutopo Purwo Nugroho, head of public relations at Indonesia's National Disaster Mitigation Agency, told Antara no one had been killed in the eruption itself but visitors were being ordered to clear the area. He said army, police and volunteers were all location to ensure the area to give assistance.