  We present results from the measurements of azimuthal correlations of charged
particles in $\sqrt{s_{_{NN}}}$ = 2.76 TeV Pb--Pb collisions and
$\sqrt{s_{_{NN}}}$ = 7 TeV pp collisions. In addition, the comparison of the
experimental measurements in pp collisions with those from Pythia and Phojet
simulations are presented.
