he Internet has become an effective tool for terrorist and radical groups to spread their propaganda. One ofthe current problems is to detect these radical messages in order to block them or promote counter-narratives.In this work, we propose the use of stylometric methods for characterizing radical messages. We have used amachine learning approach to classify radical texts based on a corpus of news from radical sources such as theso-called ISIS online magazines Dabiq and Rumiyah, as well as news from general newspapers. The resultsshow that stylometric features are effective for radical text classification.