Are Martyrs guaranteed 70 virgins in Heaven?
This is not an authenticate Prophetic Tradition (Hadith). However, in Islam martyrs are promised a great reward from God, just as war heroes are honored in many societies. However, a Muslim who dies commandeering a plane-load of civilians into a building full of civilians, or blowing up innocent people on trains or buses, jeopardizing the safety and security of Muslims throughout the world, and opening the way for antagonistic forces to slander, denigrate, and vilify Islam cannot be considered a martyr. Terrorists are mass murderers, not martyrs.