  The statistical expectation values of the temperature fluctuations of cosmic
microwave background (CMB) are assumed to be preserved under rotations of the
sky. We investigate the statistical isotropy of the CMB anisotropy maps
recently measured by the Wilkinson Microwave Anisotropy Probe (WMAP) using
bipolar spherical harmonic power spectrum proposed in Hajian & Souradeep 2003.
The Bipolar Power Spectrum (BiPS) is estimated for the full sky CMB anisotropy
maps of the first year WMAP data. The method allows us to isolate regions in
multipole space and study each region independently. This search shows no
evidence for violation of statistical isotropy in the first-year WMAP data on
angular scales larger than that corresponding to l~60.
