  We present a study of the kinematics of 101 stars observed with VIMOS around
Whiting1, a globular cluster embedded in the Sagittarius tidal stream. The
obtained velocity distribution shows the presence of two wraps of that halo
substructure at the same heliocentric distance as that of the cluster and with
well differentiated mean radial velocities. The most prominent velocity
component seems to be associated with the trailing arm of Sagittarius with
$<v_{\rm r}>$ ~ -130 km/s, which is consistent with the velocity of Whiting1.
This result supports that this globular cluster was formed in Sagittarius and
recently accreted by the Milky Way. The second component with $<v_{\rm r}>$ ~
120 km/s might correspond to the leading arm of Sagittarius, which has been
predicted by numerical simulations but with no conclusive observational
evidence of its existence presented so far. This detection of the old leading
wrap of Sagittarius in the southern hemisphere may be used to confirm and
further constrain the models for its orbit and evolution.
