Islam prohibits suicide in any form for any purpose. And Islam prohibits any kind of killing out of a fair judiciary purpose. Even for judiciary it is not recommended if other options are fruitful. Allah says that in quran 4:29 – Surah An-Nisa.
So, ISIS / Taliban / Alkhaida / Boko Haram all of them are not ISLAMIC groups but political movements who used to hijack our beautiful way of life. Muslims all over the world need to work together against this. In Sha Allah for a better future for the mankind.
For your curiosity here is a download link of a Quran English translation.