This paper describes the participation of the IRIT team to the TRAC 2018 shared task on Aggres-sion Identification and more precisely to the shared task in English language. The three followingmethods have been used: a) a combination of machine learning techniques that relies on a setof features and document/text vectorization, b) Convolutional Neural Network (CNN) and c) acombination of Convolutional Neural Network (CNN) and Long Short-Term Memory (LSTM).Best results were obtained when using the method (a) on the English test data from Facebookwhich ranked our method sixteenth out of thirty teams, and the method (c) on the English testdata from other social media, where we obtained the fifteenth rank out of thirty.