  We explore the dependence of the pT correlations in the event-by-event
analysis of relativistic heavy-ion collisions at RHIC made recently by the
PHENIX and STAR Collaborations. We point out that the observed scaling of
strength of dynamical fluctuations with the inverse number of particles can be
naturally explained by the formation of clusters. We argue that the large
magnitude of the measured covariance implies that the clusters contain at least
several particles. We also discuss whether the clusters may originate from
jets. In addition, we provide numerical estimates of correlations coming from
resonance decays and thermal clusters.
