What's your view of Islamic extremists planning attacks (stated in URL)
A Muslim must never be extreme when it comes to religion
The Prophet Muhammad (peace be upon him) said:
"Religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So you should not be extremists, but try to be near to perfection and receive the good tidings that you will be rewarded.
Sahih Al-Bukhari, Volume 1, Hadith 38
The Prophet Muhammad (peace be upon him) stated, “Beware of excessiveness in religion for those before you only perished due to excessiveness in religion.” [Ahmad, Musnad]