Muslims Against Wanton Killings and Terrorism

Muslims are taking a decisive stance against any wanton killings and terrorism without exception:

Suicide or 'martyrdom'-operations are unlawful and cursed

2- To kill oneself in the course of battle is either forbidden just as suicide is forbidden haram or - at least - a doubtful course of action, for if it comes close to suicide it belongs to the area of doubtful actions which the believer has to avoid.
Another matter is to be killed the course of battle while knowing that this can be the probable outcome, which is not the same as turning oneself into a 'human' bomb and entering civilian, non-military areas.
In the first case the intention is to fight the enemy while risking death or capture, in the second it is to fight the enemy while killing oneself.

LivingIslam - IslamicTradition