The Japanese International Cooperation Agency (JICA) warned of possible great lava slide along several rivers on Mt. Merapi's slope in Indonesia in the upcoming rainy season.

Head of a JICA delegation to Yogyakarta, Kato Keichi, said that Gendol river was the most dangerous one as it had large deposit of volcanic materials upstream, reported the national Antara news agency Tuesday.

"Our survey showed that volcanic materials in Gendol river can be easily carried downstream by water," Keichi was quoted as saying after a meeting with Yogyakarta Governor Sri Sultan Hamengku Buwono.

He stressed the need of an early warning system for tourists and residents working on the river's downstream especially entering the rainy season as cold lava could strike anytime.

Source: Xinhua