Shaykh Al-Fawzaan said, “This group [the Khawarij] has left the Muslims, rebelling against them – this is the result of disassociating oneself from the scholars…
They broke away from the scholars, broke away from the Muslim leaders, and the disbelievers and hypocrites put these ideologies into their heads.
So, they have become outcasts in Muslim societies.
They are Khawarij, no doubt. This act [terrorist acts] of theirs is the act of the Khawarij.
Rather, they are even more violent and extreme than the [original] Khawarij. The [past] Khawarij did not use to destroy buildings and residents. The Khawarij used to show up face-to-face on the battlefield. They used to fight on the battlefield despite what they were upon of ignorance.
But they did not used to collapse buildings on everyone inside them – women, children, the innocent, those at peace with Muslims [from the non-Muslims], people with whom Muslims have a treaty, and other people guaranteed safety.
The Khawarij used not to do this. This is worse and more violent than the actions of the (original) Khawarij. This is more like the actions of the Qaramitah (a severely violent, misguided sect).
They are more like the Qaramitah because the actions of the Qaramitah are secret, based on secrecy and underhandedness and what these people today do is also based on secrecy.
The (former) Khawarij – their actions were not kept hidden and secret; they would make themselves and their objectives known, publicly announcing them.
So, these people are even worse than Khawarij.”
Ref: pdf from salaf-us-saalih.com
Posted by Abdul Kareem Ibn Ozzie