This paper presents the first results of a research on the prosodic specificities of French speakers living in two poor multi-ethnic suburbs located in the north of Paris and in Rouen. The emphasis is on the acoustic analysis and the comparison of some particular prosodic patterns which are frequently used in the suburban youth speech. We show that there is no noteworthy difference between speakers from both suburbs. In particular, we found that both groups of speakers use rise-fall patterns associated with short syllables at the end of IP. This pattern is atypical in standard French, and its presence in both groups suggests that it constitutes a prosodic marker that is essential to the suburban accent identification.