"Scientists say the eruption is not expected to be a repeat of the 1980 catastrophe that killed 57. On May 18th of that year the volcano blow out the sideways, creating a massive landslide, melting glaciers and flooding downstream communities under massive mud flows."

Taken from http://www.wistv.com/Global/story.asp?S=2404753

The volcano blow out the sideways, huh. That's pretty fucked up.