(Adds prayers, comments from rights body, environmentalist) By Heri Retnowati PORONG, Indonesia, May 29 (Reuters) - Two years after a mud volcano started erupting on Indonesia's Java island, thousands ...

Social media videos showed people running into the streets as bright orange flames and smoke spewed into the sky.

On May 29, 2006, mud and steaming hot water squirted up in a rice field in Sidoarjo, East Java, marking the birth of the world's most destructive mud volcano. Stringer / Indonesia / Reuters / Corbis ...