  The motivation for a cosmic muon veto (CMV) detector is to explore the
possibility of locating the proposed large Iron Calorimeter (ICAL) detector at
the India based Neutrino Observatory (INO) at a shallow depth. An initial
effort in that direction, through the assembly and testing of a $\sim$ 1 m
$\times$ 1 m $\times$ 0.3 m plastic scintillator based detector, is described.
The plan for making a CMV detector for a smaller prototype mini-ICAL is also
outlined.
