Irene writes:

Authorities are probing twin suicide bombings in a crowded Shiite mosque that killed 27 people in a south-eastern province ravaged by a Sunni insurgency.

Two suicide bombers killed at least 28 people, including elite Revolutionary Guards, at a Shiite Muslim mosque in south-east Iran on Thursday night, an attack Iranian leaders

The method chosen in a suicide attempt may predict the risk of a future suicide attempt. New research suggests that individuals who use more violent methods such as hanging, drowning, firearms or jumping from heights are more likely to repeat similar attempts. People who attempt suicide by highly lethal methods are likely to choose the same means [...]