British Prime Minister David Cameron has called for a fight against the radical ideology of the Islamic State group, calling it one of the biggest threats for our world.

Addressing a major security conference in the Slovak capital Friday, Cameron said it is necessary for everyone, from governments to communities and families, to do all they can to prevent young people in the West from becoming radicalized and getting recruited to fight for the extremists.

Cameron said the evil ideology is using the Internet as its tool and is so potent in influencing dissatisfied, angry young men and women because it is quietly condoned online or even in parts of communities.

Cameron said it is vital to stop the radicalization at its source.